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* AmbiguouslyEvil: They once defected from the OmniscientCouncilOfVagueness and took a seal for themself. In the present, they offer you [[DealWithTheDevil strange deals]] throughout the facility. They'll also fight you if you try taking their seal, but they likely know what'll happen if you get all the seals and make it to the end of the facility, and they're trying to stop that.
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* AmbiguouslyEvil: They once defected from the OmniscientCouncilOfVagueness and took a seal for themself.themselves. In the present, they offer you [[DealWithTheDevil strange deals]] throughout the facility. They'll also fight you if you try taking their seal, but they likely know what'll happen if you get all the seals and make it to the end of the facility, and they're trying to stop that.
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* DesperationAttack: In the middle of the fight, they pause their typical attack patterns to fire one of two patterns of powerful bullets from themself.
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* DesperationAttack: In the middle of the fight, they pause their typical attack patterns to fire one of two patterns of powerful bullets from themself.themselves.
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* DoppelgangerAttack: The Warden can split themself into multiple copies for some of their attacks, as well as create copies of their sword/staff.
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* DoppelgangerAttack: The Warden can split themself themselves into multiple copies for some of their attacks, as well as create copies of their sword/staff.
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* TakingYouWithMe: If you defeat it, it'll attempt to take you with it into the void. You can flip this on it by defeating its core, destroying it permanently.
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* TakingYouWithMe: If you defeat it, it'll attempt to take you with it into the void. You can flip this on it by defeating its core, destroying it permanently. (The trope itself will still be played straight in the sense that you're stuck in the void with no way out, though.)
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Click [[Characters/{{Monolith}} here]] for player characters and [=NPCs=].
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[[folder:Excavation]]
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[[folder:Chamberlord]]
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[[folder:Maintenance System]]
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[[/folder]]
[[folder:Devourer]]
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[[folder:Ice Wyrm]]
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[[/folder]]
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!!Nightmare
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[[folder:Nightmare]]
!!Nightmare (Genesis and Oblivion)
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[[folder:Sanctum]]
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[[folder:Reward Bosses]]
!!Both of them
!!Both of them
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!!Both
[[folder:Both of
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[[/folder]]
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[[folder:Seal Bosses]]
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[[/folder]]
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[[folder:True Final Bosses]]
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[[folder:Normal Floor 6 Boss]]
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[[folder:Temple Bosses]]
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[[/folder]]
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[[WMG:[[center: [- ''VideoGame/StarOfProvidence'' '''[[Characters/StarOfProvidence Main Character Index]]'''\\
[[Characters/StarOfProvidenceEnemies Enemies]] | '''Bosses'''\\
]] -]]]
'''Due to the nature of ''Star of Providence''[='s=] gameplay and lore, there are no spoiler tags on this page.'''
Click [[Characters/{{Monolith}} here]] for player characters and [=NPCs=].
----
[[folder:Excavation]]
!!Chamberlord
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/chamberlord.png]]
* ArcSymbol: The background of its fight looks like two overlapping squares with a circle in the middle.
* BadBoss: If too many of its Chamberheads are left alive, it performs a unique attack that destroys them.
* FlunkyBoss: Sporadically flings out Chamberheads towards you. When you get its health low enough, it spawns four invincible Chamberheads that remain until it's defeated.
* KingMook: To the Chamberhead enemies.
* SinisterGeometry: Like the smaller Chamberheads, it's diamond-shaped.
* TurnsRed: When its health gets low, it spawns four invincible Chamberheads and starts sending out two slowly rotating streams of bullets.
!!Forgotten Ringleader
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/ringleader_2.png]]
* BodyOfBodies: A variant; the Ringleader is actually an amalgamation of many ghosts, and they come spiraling out of its body when it is defeated.
* EvilLaugh: The Ringleader giggles at the start of the fight, and continues to giggle whenever it manages to land a hit on you.
* FlunkyBoss: The biggest example of this out of every boss in the game, summoning ghosts en masse for literally all of its attacks.
* KingMook: A big version of the common ghost enemy.
* OurGhostsAreDifferent: A large circular grinning ghost made up of myriad smaller ghosts.
* SpectacularSpinning: The [[StealthPun Ring]]leader spins ghosts around it for most of its attacks. In particular, one of its attacks has it send a circle of ghosts outwards that then start spinning at high speed while shooting bullets outwards, forcing you to stay inside the ring close to the Ringleader.
!!Guardian
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/guardian_32.png]]
* AnimatedArmor: Specifically animated by the ghost residing inside of it.
* BeamSpam: On Hard Mode, it constantly fires lasers downwards while positioning itself over you. Additionally, it also gains an attack where it rains down lasers on you from the top of the screen.
* CarryABigStick: Primarily attacks by slamming down its mace, creating bursts of bullets.
* DeathFromAbove: On Hard Mode, it gains an attack where it barrages you with lasers from above you.
* DegradedBoss: From the Sanctum onwards, weaker versions of it can spawn as regular enemies with less health and only the mace-smashing attack.
* FlunkyBoss: Has a rare attack where it summons lance-wielding ghosts from the sides of the screen that cross over, leaving a trail of projectiles behind them.
!!Grinder
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/grinder_6.png]]
* BladeBelowTheShoulder: It has razors where its hands would otherwise be.
* ClockPunk: Specifically the background of the fight, which features numerous spinning gears.
* DeadlyDisc: Grinder's whole bread and butter. It has one at the end of each of its arms that it uses for its attacks.
* EnhancedPunch: Can attempt to punch you with one of its razor-hands. On Hard Mode, the punch also sends out projectiles.
* GiantHandsOfDoom: Well, more so giant razors of doom.
* HeavilyArmoredMook: Sorta — its razors block most weapons, requiring you to wait for an opening to attack it, or otherwise position yourself creatively.
* OurMagesAreDifferent: This one has razors for hands.
[[/folder]]
[[folder:Archives]]
!!Behemoth
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/behemoth_3.png]]
* ArcSymbol: A sigil resembling [[spoiler:Monolith]] can be seen etched onto it.
* DynamicEntry: It introduces itself by ploughing in through the top of the screen, running over and damaging the player ship should they be in the way.
* TankGoodness: It's a big ol' tank.
* TurnsRed: See right below.
* WaveMotionGun: After losing enough HP on Hard Mode, it starts firing a constant laserbeam that remains until it's defeated.
!!Presence
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/presence_6.png]]
* {{Blackground}}: This boss is fought in complete darkness.
* FacelessEye: The only feature of it that can be seen is its eyeball.
* FlunkyBoss: It disappears to summons Mooks as it loses intervals of health, and reappears once they've been dealt with.
* NothingIsScarier: It's unclear whether it's just an eyeball, or if there's more to it that's hidden in the darkness.
* TeleportSpam: It does this in an attempt to get you to misfire. However, it doesn't attack while doing this.
!!Daemon
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/daemon_5.png]]
* EvilLaugh: It lets a deep one out every time it summons enemy mages.
* FlunkyBoss: At the start of the fight, it summons a pair of Electromancers followed by a pair of Stormlashes, which must be defeated before it can be properly attacked.
* GreenAndMean: It's green and it's...
* {{Jerkass}}: ...described in the MonsterCompendium as "malicious and abrasive even before this whole mess began".
* LivingProgram: Its body seems like a [[OurMagesAreDifferent magical]] projection from the screen in the room.
* LosingYourHead: On Hard Mode, its body explodes after losing enough health, leaving its head to float around with a new attack pattern.
* PlayingWithFire: Creates pillars of fire that surge across the screen and vomits large quantities of fire onto your ship.
* StationaryBoss: Its targeted head doesn't move at all, except in Hard Mode.
* TurnsRed: See LosingYourHead above.
!!Charlie
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/charlie_6.png]]
* KingMook: It's one to Skullies, particularly the variant of them with the OneWayVisor.
* FlunkyBoss: It spawns Skullies throughout the fight. On Hard Mode, it can also spawn the UndergroundMonkey variants of them.
* FlyingFace: It's a giant floating mechanical skull.
* OneWayVisor: It sports one of these, similar in appearance to one of the Skully variants. On Hard Mode, it's capable of firing a giant laser beam. Upon being defeated, it loses it.
* TurnsRed: See right below.
* WaveMotionGun: After taking enough damage on Hard Mode, it'll start firing giant laser beams out of its OneWayVisor along with a large quantity of bullets.
[[/folder]]
[[folder:Maintenance System]]
!!Armor TAC
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/armortac.png]]
* CognizantLimbs: The ends of its limbs can individually be shot, though "breaking" them only gives you scrap and prevents the spiky balls from dealing CollisionDamage.
* DynamicEntry: It introduces itself by dropping from the top of the screen, attempting to crush your ship.
* NotQuiteDead: After being defeated, its limbs blow up and it falls down off the screen... before rising back up for a second phase.
* SequentialBoss: Once its arms fall off, it's revealed to have its own pinch mode without them.
* SpiderTank: It uses its four limbs to crawl on the sides of the walls.
* VictoryFakeout: After you've depleted its first health bar, the fight isn't quite over yet.
!!Devourer
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/devourer.png]]
* AttackItsWeakPoint: Its core in its second phase must be destroyed to end the fight.
* AttackOfThe50FootWhatever: On par with Firewall for ''largest foes in the game'', its mouth reaches from the top of the screen to the bottom, and its body seems to stretch on infinitely in length.
* BadVibrations: Before the fight begins, the screen starts rumbling with some dust falling from above, and then this thing bursts through the wall on the ''left'' of the screen.
* BloodyMurder: Occasionally, its jaws will shudder before vomiting a barrage of blood bullets.
* EyesDoNotBelongThere: Floating disconnected eyes periodically appear between its jaws.
* GoForTheEye: In its first phase, its eyes must be shot to damage it.
* MoreTeethThanTheOsmondFamily: In addition to the teeth contained in its gaping maw, the [[ExaggeratedTrope entirety of the inside of its digestive system is lined with teeth]].
* SandWorm: Though more of an underground sewer worm.
* SequentialBoss: Once the "eyes" are damaged enough, you take the fight to this boss's core.
* SwallowedWhole: After breaking its eyes, it lunges forward to swallow your ship.
* TacticalSuicideBoss: Said swallowing backfires on it as it allows its core to be targeted and damaged.
!!Ice Wyrm
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/icewyrm.png]]
* CyberCyclops: Once the true form of its head is revealed.
* AnIcePerson: It launches icicles and frost-like bullets at you.
* IceQueen: {{Implied|Trope}} to be of a non-defrostible variety, "ranked dead last in dateability".
* LegendaryCarp: It's said to have once been a fish that leapt to the top of a waterfall.
* SegmentedSerpent: It's composed of multiple segments that can individually be broken to limit its attacks, except on Hard Mode, where doing so gives them new attacks. Piercing weapons like the Drill can do massive damage against it as a result.
* StalactiteSpite: It can form stalactites from its body and drop them onto your ship.
* TearOffYourFace: The ice-made "mask" that appears to be its face is lost once it TurnsRed.
* TurnsRed: Once it loses half of its health, it shoots bullets less often and spends much of its time quickly chasing your ship.
!!Fish
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/fish_9.png]]
* AnimalMecha: It's a mech shaped like a fish.
* ADogNamedDog: What's the name of the fish mecha? Fish.
* DynamicEntry: It introduces itself by swimming from the left of the screen in an attempt to hit you.
* FlunkyBoss: Hordes of smaller fish swim through the arena, and a wave of Blastcores make an appearance for one of its attacks.
* KingMook: To all of the robotic fish found throughout the Maintenance System.
* UnderwaterBossBattle: It can periodically change the water level in its arena, submerging your ship.
[[/folder]]
[[folder:Bellows]]
!!Reactor
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/reactor.png]]
* CoresAndTurretsBoss: The Reactor Core fight has five stationary targets that can also shoot at you.
* FlunkyBoss: It periodically opens one of its hatches to release a swarm of Crazy Ghosts, and when its brought down to half HP it releases two Heavy Sentinels.
* ReactorBoss: The Bellows' reactor that you could have to fight as its main boss.
* ShieldedCoreBoss: In the Reactor Core fight, the "canisters" in the corner must be broken before the main core can be damaged.
* ShockAndAwe: It frequently rains down electric beams across the screen.
* StationaryBoss: Bolted to the top of the room, it doesn't move at all.
* TacticalSuicideBoss: {{Inverted|Trope}}. Its eye is closed while any Heavy Sentries are active, rendering it invincible.
* VictoryFakeout: After defeating it on Hard Mode, you leave the floor, expecting to head down to the Sanctum like usual... only to enter a new room and see "REACTOR CORE".]]
!!Ordinator
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/ordinator.png]]
* FlunkyBoss: The living blocks used in a certain attack eventually turn into Blazing Skullies.
* GiantHandsOfDoom: It creates fiery blasts with them.
* LosingYourHead: After taking enough damage its head gets destroyed, causing it to go berserk.
* PlayingWithFire: Naturally as the head of the school of pyromancy, it barrages your ship with fire.
* RobotWizard: It's robotic underneath its robes, best shown when you [[LosingYourHead blow its head off]].
* TurnsRed: Once [[LosingYourHead its head falls off]], enormous jets of flame erupt to the sides of the screen while it shoots bullets spreads at you.
* TyrantTakesTheHelm: Is implied to have taken control of the OmniscientCouncilOfVagueness, and attempts to wield the Power Eternal.
!!Firewall
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/firewall.png]]
* DynamicEntry: It first appears firing several jets of flame.
* GeniusLoci: Described by Kleines as "more of a location than a creature".
* PlayingWithFire: It spews flame from all over itself.
* PunnyName: Firewalls are a kind of computer security program.
* TurnsRed: Once it's damaged enough, it starts firing large jets and balls of flame from near the top of the screen.
!!Nightmare
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/nightmare_4.png]]
* AngelicAbomination: Genesis resembles an abstract angelic construct, in contrast to [[EldritchAbomination Oblivion]].
* BloodyMurder: Oblivion sprays out large quantities of blood bullets for some of its attacks.
* CombinationAttack: They co-ordinate their attacks during phase three.
* DualBoss: During the short-lived, Hard-difficulty-exclusive third phase.
* EldritchAbomination: Oblivion is a large oval "portal" that houses a giant eyeball that can shoot out copies of itself and also turn into a gnashing mouth, and it can summon onslaughts of hands with eyeballs in their palms from the portal.
* EnemyCivilWar: They don't get along with each other very well, which is shown when Oblivion ''devours'' Genesis after it's been defeated.
* EnemyMine: Though they don't like each other very much, they're willing to work together to defeat your ship in Hard Mode.
* EyesDoNotBelongThere: The hands that Oblivion summons have eyes in their palms.
* FacelessEye: Oblivion's most distinctive feature is its massive eye, which sometimes transforms into a [[MoreTeethThanTheOsmondFamily toothed mouth]]. Additionally, it can create copies of it that shoot at your ship.
* GiantHandsOfDoom: Oblivion summons hands ''en masse'' for its attacks, which have [[EyesDoNotBelongThere eyes in them]].
* NotQuiteDead: In Hard Mode, Genesis gets spit out of Oblivion in phase three, albeit heavily chewed up.
* SequentialBoss: The two different entities are fought separately in one battle.
* ShoutOut: The two entities that compose Nightmare have the same names as [[VideoGame/JenkasNightmare the halves of another boss named "Nightmare"]].
* VictoryFakeout: When Genesis is defeated, it is swallowed by the enemy you fight next, Oblivion. In Hard Mode, Oblivion later spits out a half-chewed Genesis and the two are fought together.
[[/folder]]
[[folder:Sanctum]]
!!Overlord
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/overlord_9.png]]
* BeamSpam: They have a habit of shooting fast-moving white lasers all over the place, and one of their attacks in their second phase involves them repeatedly trying to jump to align with you horizontally before firing a giant laser straight down.
* {{Blackground}}: The background for the fight is pitch-black — until they transition to their second phase, that is.
* BloodyMurder: They have an attack in their second phase that can only be described as a blood shotgun.
* CoolMask: Wears an orange one. They lose it on Hard Mode.
* CyberCyclops: On Hard Mode, a menacing red eye takes the place of where their mask used to be.
* DeathFromAbove: During their third phase, one of their attacks is to spawn multitudes of blue bullets that rain down.
* DidntNeedThoseAnyway: They lose parts as each phase is beaten — large bits of machinery keeping them tethered to the ceiling for their first phase, and their "legs" for the second. However, they keep fighting you with their remaining weaponry.
* DiscOneFinalBoss: Overlord is the final boss you'll fight on a run at first, but defeating them will allow you to obtain the seals on future runs, ultimately allowing you to progress further beyond.
* EmergingFromTheShadows: At the start of the fight, they slowly emerge from the black background until they're fully visible.
* FallenHero: Implied with their MonsterCompendium entry that they failed in their duty and became a guardian of floor 6.
* FinalBoss: In any run of the game prior to accessing the forbidden levels of the facility, they are this trope proper.
* GateGuardian: They guard the gate to floor 6, though you'll still need all the seals to make it through proper.
* HumongousMecha: Resembles one, particularly for their second phase when they're detached from the ceiling and start jumping around on their legs.
* MoreDakka: Possesses an impressive arsenal of armaments with which to unleash BulletHell on you with.
* SequentialBoss: Has three individual phases that must be fought without any breaks in-between.
* ShouldersOfDoom: They have a pair of weapon arrays that resemble these.
* WakeUpCallBoss: By far the most difficult opponent you'll have fought at this point in the game, to defeat them you'll have to contend with MultipleLifeBars and an overwhelming amount of BulletHell, so they're a good indicator of what's to come in Floor 6.
[[/folder]]
[[folder:Reward Bosses]]
!!Both of them
* HoldTheLine: The main mechanic of each fight is that it ends automatically after a period of time, but the more damage is done to the boss during that timeframe, the more rewards it drops.
* OptionalBoss: They can be fought on any floor, but doing so is not required to progress.
** Microcore is found in some shortcuts and must be interacted with to start the fight.
** Trespasser appears from a portal that spawn after breaking one of certain breachstones.
* TimeLimitBoss: {{Inverted|Trope}}; each fight ends after enough time passes.
!!Microcore
[[quoteright:120:https://static.tvtropes.org/pmwiki/pub/images/20220112213327_1.jpg]]
* AttackDrone: It spawns smaller versions of itself as additional units for some of its attacks, though they despawn automatically after a short bit.
* ConfusionFu: It has a wide pool of attack patterns that it randomly picks four from to use in a random order when it's fought.
* SchmuckBait: Once you approach the inactive core, warning signs spawn and raise an alert. Be sure not to ignore those...
* WeaponOfMassDestruction: Described as such in the MonsterCompendium, it was stowed away in a shortcut room.
!!Trespasser
[[quoteright:322:https://static.tvtropes.org/pmwiki/pub/images/20220112213332_1_8.jpg]]
* EldritchAbomination: A huge horned one-eyed creature -- originating from the void -- vaguely resembling a spider that shoots out spike-tipped tentacles that grow additional eye-shaped objects on them.
* GoForTheEye: Not its main eye, but eye-looking weak spots periodically appear along its tentacles that must be destroyed to damage it.
* LuckBasedMission: Getting this thing to show up in the first place is one, as the only way to get it to spawn is a 10% chance from breaking a breachstone.
* NonMaliciousMonster: According to the MonsterCompendium, it's not necessarily malicious, just yearning for a stability that its realm rarely provides.
* OurMagesAreDifferent: While it's very unclear why, this bullet-spraying, vaguely spider-like being counts as one.
[[/folder]]
[[folder:Seal Bosses]]
!!Special Offer
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/specialoffer.png]]
* AdamSmithHatesYourGuts: {{Parodied| Trope}}. This boss fight is the result of Bloke trying to force you to pay 1 million debris for one of the seals and requiring Null to "haggle" with him to get a reasonable price by shooting the seal while avoiding his mech's attacks. Not even ''Kleines'' is that greedy, considering he sells a seal for ''just'' 100k debris.
* BallisticDiscount: Literally — you have to shoot the seal to lower its price enough for you to grab it.
* DoYouWantToHaggle: Bloke has a strange idea of this trope; see above.
* FingerGun: Bloke can shoot projectiles and lasers from his mech's hands.
* GiantHandsOfDoom: Bloke's mech attacks you with these, mainly using them to punch and [[FingerGun shoot bullets.]]
* HumongousMecha: Bloke pilots one for the fight, presumably built from all the debris you've given him. Curiously, it resembles Null.
* InstantBandages: Humorously, after defeating him, in future shops, he'll appear to have a bandaged head.
!!Renegade
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/renegade_2.png]]
* AmbiguouslyEvil: They once defected from the OmniscientCouncilOfVagueness and took a seal for themself. In the present, they offer you [[DealWithTheDevil strange deals]] throughout the facility. They'll also fight you if you try taking their seal, but they likely know what'll happen if you get all the seals and make it to the end of the facility, and they're trying to stop that.
* BossBanter: If you manage to defeat them, they'll urge you to let go of the past.
* DeathFromAbove: For the last part of the fight they'll start raining down bullets from the ceiling, giving the impression that they're collapsing the room to stop you.
* DefectorFromDecadence: They used to be part of the OmniscientCouncilOfVagueness at some point in the past, but forcefully defected from them and likely stole a seal for good measure, hence their name.
* DesperationAttack: In the middle of the fight, they pause their typical attack patterns to fire one of two patterns of powerful bullets from themself.
* LivingStatue: If you accept the deal to face death, they will come to life to fight you.
* SchmuckBait: One of their deals is to obtain a seal, but "face death." If you're unprepared, you will get what you expect from it if you take it.
* StationaryBoss: Even while fighting you, they don't move around.
* TurnsRed: Near the end of the fight, they will start raining bullets from the ceiling.
[[/folder]]
'''Major unmarked spoilers below!'''
[[folder:True Final Bosses]]
!!The Machine
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/themachine_4.png]]
* AmazingTechnicolorBattlefield: The red and black patterned background of Floor 6 scrolls by upwards rapidly during the last phase of the fight.
* ArcSymbol: Its final form's prongs are of asymmetric length once one of them is partly broken off, reminiscent of the shape of the facility.
* BackgroundBoss: It's rendered behind your player ship, though the bullets it shoots out spawn on the foreground.
* BackToFront: In terms of the order the ships fight it. Chronologically, ??? fights it first, followed by Overlord, before Null finishes it off, though you see these fights play out in reverse order in-game.
* BeamSpam: Is fond of summoning runic circles around the room that fire lasers at you. In fact, this is its only attack during its slab phase.
* BoomerangComeback: One attack in its second and last vs.-Null phases is to fire streams of bullets that shortly start flying backwards.
* ClimaxBoss: A mighty guardian of the Power Eternal. Defeating it truly completes Null's run and unlocks the road to further revelations about the game's story.
* EarlyBirdCameo: The first form the player encounters is seen up-close in the pause menu at the Sanctum and the floor below.
* EldritchStarship: Has the appearance of one, resembling a gigantic spaceship with a sinister looking eye and jagged parts resembling demonic horns.
* GlassCannon: The last sub-boss of Database is this, being an infant version of this boss. It lasts only as long as one phase of its current self, but as a sub-boss that's barely bigger than the PlayerCharacter, it can deal double damage while its grown self cannot.
* GoForTheEye: Its eye is the only part of it that the player can hit in most of its forms. Originally, it had the appearance of a white circle, though after the fight with Overlord, it's broken to reveal a more organic looking one.
* HeadsIWinTailsYouLose: Without the glitched cartridge that grants access to Nowhere, ??? gets destroyed regardless of the outcome of their fight against this boss. Narrowly {{subverted|Trope}} with Overlord, however, if the boss Overlord is interpreted as the result of the player Overlord claiming the Power Eternal (another ??? ship [[HeroicSacrifice gives up its life]] to save Overlord from the Machine's cutscene attack).
* KaizoTrap: Once its health is depleted in either pre-Null form, it fires yellow lazer blasts in the top half of the screen that can still damage (or even destroy) your ship.
* TheMonolith: The slab it's trapped in resembles one, funnily enough more than the boss that's actually named after it.
* NoNameGiven: Introduced with eight scrambling letters in place of its name, and otherwise called "Unknown". The only instances where it is called by name are the Hard difficulty end credits, a report of the player defeating it and claiming Power Eternal, and its practice fight preface once Monolith has been defeated before as well.
* NonIndicativeName: Although its name and the initial NoNameGiven are both rather intimidating, this boss is not a mech, but a [[AnimateInanimateObject construct]].
* PostDefeatExplosionChain: Weaponized [[HeadsIWinTailsYouLose against ???]], intentionally or otherwise.
* RouteBoss: Different forms of it are fought when you play as Overlord or ??? at Normal difficulty. These two pre-Null versions are very similar to each other, and they both have different attacks from when it is fought by Null. It is also this as a sub-boss of Database.
* SequentialBoss: It initially appears as a giant slab with a rune in the center of it that must be shot at. After damaging it enough, the rune breaks open, revealing a menacing eye. After shooting the eye enough times, the slab seemingly descends downwards before cracking wide open, finally revealing the spaceship-like form hidden within the slab. The Machine could also be considered a sequential boss in that it is [[ExaggeratedTrope fought across the span of three characters]]. Initially, the Chaos ship first encounters and damages it, followed by the Overlord ship fighting and damaging it further, causing it to seal itself in the slab form that you first fought as Null.
* StationaryBoss: Its first two forms don't move at all. Averted for the versions fought by ??? and Overlord, as well as it as a sub-boss of Database.
* TrueFinalBoss: Fought below the seal at Normal difficulty.
* TurnsRed: Two instances in the vs.-Null final phase:
** A {{downplayed| trope}} example: when the health bar is below half, this boss's triple WaveMotionGun attack is replaced with four beams, and its {{roboteching}} spiral attack has more bullets per volley.
** When the boss is at critical health, the background and foreground brighten, and the Machine moves near the top of the screen for a set of two new attacks.
* VictoryFakeout: That pillar you seemingly destroyed seemingly falls down… and then returns as its original (yet battle-torn) spaceship-esque form and gives Null quite a run for their money!
!!Monolith
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/monolith_2.png]]
* AngelicAbomination: Its bright glowing wings and white color scheme give it an angelic appearance.
* AntagonistTitle: This boss is the eponymous figure of the game. Not the facility. Not the Machine. THIS.
* ApocalypseHow: Its MonsterCompendium entry indicates that a certain being, similarly to Null, obtained Power Eternal and spent their last moments destroying the facility and most living society around it (likely akin to the mirror practice boss portrait).
* ArcSymbol: It [[DeadlyUpgrade looks very similar to]] the parts of upgrade terminals that encapsulate the player ship.
* BossRemix: The song that plays for the first part of the fight is a remixed version of the song that plays for the tutorial fight — fitting since the tutorial fight was Null sparring with D-13.
* ConfusionFu: It has a variety of fast-moving attacks under its belt, and its first two phases have '''no set order of attacks''', making it a very unpredictable foe.
* CueTheSun: After taking enough damage, it ascends high enough for the rising sun to be visible as a backdrop to the last part of the fight.
* DuelingPlayerCharacters: It and D-13 are the first two ships you play as in the game.
* FaceHeelTurn: Null turns on D-13 after taking the Power Eternal.
* FinalBoss: Fought below the seal at Hard difficulty, at a point where the sixth floor's existence is obvious.
* HighAltitudeBattle: A ways into the fight, it busts through the ceiling of the facility, taking the fight to the sky above the city. Furthermore, the screen expands vertically for the fight to increase the amount of room you can fight in, changing the appearance of parts of the UI like your HP.
* HistoryRepeats: Stated in its MonsterCompendium entry. It is unknown if it speaks of a scenario in which D-13 failed to stop Null as Monolith, or if it occurred far in the past.
* MarathonBoss: Despite only having a single health bar, it may very well have the highest health pool out of anything in the game. You're gonna be fighting this guy for a while.
* MeaningfulName: It perfectly fits an alternate definition of the word "monolith": a sizable and impersonal structure that acts as a singular body of '''power'''.
* MirrorBoss: To an extent — many of the attacks it uses are based off the weapons you can find in the game.
* PowerAtAPrice: The price being Null's sanity, evidently.
* PowerGivesYouWings: It's gained several wings that are seemingly made of light.
* RouteBoss: On Hard Mode, it takes the place of The Machine, showing up directly after when The Machine would otherwise appear.
* RunicMagic: It has a plethora of runes constantly orbiting around it which it uses for many of its attacks.
* SadBattleMusic: Melancholic tones of its battle themes set them apart from the rest of the game's soundtrack.
* SuperpoweredEvilSide: The Power Eternal has made Null very powerful, and very insane.
* TitleDrop: If it being a powered-up version of your first player ship didn't tip you off, it sharing a name with the game should make it clear that it's a big deal.
* TragicMonster: The result of Null having succumbed to Power Eternal and getting turned into a construct whose sole aim is to destroy.
* TrueFinalBoss: Of the story as a whole, fought near the very end of ''Monolith'''s timeline.
* WalkingSpoiler: The existence of this boss reveals what happened to Null after obtaining the Power Eternal.
* WithGreatPowerComesGreatInsanity: The Power Eternal has granted it immense power, as well as seemingly not recognising its former friend anymore.
!!Database
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/database_7.png]]
* AIIsACrapshoot: The database has been corrupted likely due to the influence of the glitched cartridge, and it attempts to "purify" the player ship when they find it.
* BloodyMurder: Certain Devourer eyes spawned by Omniscient explode into shotgun spreads of blood projectiles. While you fight Abyssal, said projectiles fall into the Devourer mouth when it [[VacuumMouth tries to suck you downwards]]. The infant Machine can also shoot radial bursts of these particles as one of its second sub-phase's attacks.
* BossBanter: When the player ship first encounters it, it welcomes them to the facility before noting that it's been corrupted, proceeding it to deem them a threat. After it's been defeated, it thanks the visitor for using the facility database.
* BossBonanza: Database summons three sub-bosses to fight in its stead over the course of the battle.
* ConfusionFu: Its main attacks are random, and it summons three out of eight different [[MixAndMatchCritters sub-bosses]] in a random order each time it is fought.
* DeathFromAbove: Abyssal, Phoenix Gunship, and Thaumaturge each have an attack that involves raining many bullets from the ceiling.
* EpicFlail: The sub-boss Iron Magus wields one, and it's fond of dropping it down and swinging it in a wide circular motion to catch your ship. It appears to be recreated from one of Armor TAC's limbs.
* {{Expy}}: Of [[VideoGame/TheTaleOfAlltynex ALLTYNEX,]] being a rogue MasterComputer CyberCyclops in a ShootEmUp. Additionally, one of the sub-bosses is a white winged figure with the ability to shoot out blades from its face and from the sides of the room, named [[VideoGame/HollowKnight "The Radiant"]].
* FacelessEye: One that's very reminiscent of [[Film/TwoThousandOneASpaceOdyssey HAL.]] One of the sub-bosses has one as well, Omniscient being Presence's eye surrounded by Chamberlord's vertices.
* FinalBoss: Gets demoted to this for those who seek it out in order to reach for higher and higher [[NumericalHard loop settings]].
* FireIceLightning: The sub-boss Thaumaturge utilizes this in its attacks. Presumably, fire and ice are taken from Daemon's head and Ice Wyrm's body segment, and lightning from Reactor's "eye".
* {{Flashback}}: The boss weaponizes this! During the last part of the fight, Database playbacks the creation of The Machine while your ship is caught in the midst of it, taking damage if they touch the bullets.
* FlashStep: Phoenix Gunship zips around this way.
* FlunkyBoss: Iron Magus and Late Knight summon ghosts as part of certain attacks. Omniscient also summons Devourer eyes for two of its attacks.
* HighTechHexagons: Most of its main form's attacks involve it generating these around the screen, which then fire off various bullet patterns.
* HoverTank: One of the sub-bosses, Phoenix Gunship, is a winged craft with parts taken from Behemoth, Overlord, and Monolith.
* InsistentTerminology: None of the sub-bosses are recognized as separate entities, so the death message for this fight is always "Ended by Database" (humorously, even if you die while fighting an amalgamation or the infant Machine).
* InstantDeathRadius: {{Inverted|Trope}}; one of the sections of the Infant Machine phase forces your ship to stay in a small circular zone around it while the area outside is bombarded by walls of bullets that are blocked by the zone.
* LosingYourHead: {{Inverted| Trope}}; Ordinator's head plops onto Guardian's torso when the player is introduced to sub-boss Iron Magus.
* MatrixRainingCode: Present in its portrait.
* MeaningfulBackgroundEvent: In the final phase, several mages are present in the background overlooking the fight — presumably they are the ones channelling the Power Eternal into the vessel you are fighting.
* MixAndMatchCritters: The sub-bosses created by Database resemble parts of other bosses mashed up together in creative ways — for example, Leviathan appears to be Fish with Charlie's visor grafted onto it, and Iron Magus is composed of Guardian's body with Ordinator's head sitting atop it, wielding a flail fashioned after one of Armor TAC's limbs.
* NumericalHard: The four main phases have increasing numbers of bullets or attacks in some of the attacks they share.
* OurMagesAreDifferent: Two of the sub-bosses, Iron Magus and Thaumaturge. The first is an armored mage that wields a flail along with fire magic, while the latter has an eye embedded in its neck-stump and carries Daemon's head and one of Ice Wyrm's body segments in its hands, enabling it to use various elemental magics.
* PlayingWithFire: Several of the sub-bosses, especially Iron Magus and Phoenix Gunship, are capable of this.
* SeaMonster: One of the sub-bosses is dubbed "Leviathan". It resembles Fish with Charlie's OneWayVisor.
* SequentialBoss: Counting its sub-bosses, it has a total of eight phases, [[ExaggeratedTrope and its final phase has four sub-phases of its own!]]
* SharedLifeMeter: Abyssal and the Devourer mouth both show signs of defeat once the former is hit enough.
* ShoutOut: It states that your ship is a "[[VideoGame/TheBindingOfIsaac Void]]-class threat", and right before the fight begins, it declares "[[VideoGame/{{Off}} Purification in Progress…]]"
* StationaryBoss: In its main form, it stays in place with its eye in the centre of the screen.
* {{Superboss}}: To fight this boss, you must find a secret cartridge, defeat the TrueFinalBoss at floor 6, and then venture throughout Nowhere.
* TacticalSuicideBoss: {{Inverted|Trope}} with Abyssal, which cannot be hit while the Devourer mouth shoots laser blasts from below.
* TeleportSpam: Omniscient, Abyssal, and Phoenix Gunship each do this for one or two of their attacks.
* TimeStandsStill: The infant machine can freeze the bullets getting sucked into it, though your ship's still free to move around, possibly causing it to run into the frozen bullets.
* VacuumMouth: The Devourer mouth of sub-boss Abyssal sometimes tries to suck you into it so you're low enough on the screen for it to bite you, all the while forcing you to dodge the [[BloodyMurder blood particles]] [[DeathFromAbove that fall from the ceiling]].
* WarriorUndead: The sub-boss [[StealthPun Late Knight]] appears to be Forgotten Ringleader encased in a suit of armour fashioned from Armor TAC.
* WaveMotionGun: Leviathan can fire a large beam that rains particles both in directions perpendicular to it and from where it hits the top of the screen.
* WreathedInFlames: The ghost knights summoned by Iron Magus use this very effectively, leaving fire bullets and trails everywhere if they aren't killed.
[[/folder]]
[[folder:Temple Bosses]]
!!The Warden
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/thewarden_6.png]]
* AuthorAvatar: Of the developer [=PureQuestion=].
* BossBanter: Before you fight them, they'll have some dialogue about [[ReluctantWarrior how they wish they could've met you under better circumstances]], and if you defeat their Tier-4 version, they'll tell you not to let [[EldritchAbomination it]] free before [[KilledOffForReal expiring.]]
* ConfusionFu: Well, they're literally made out of question marks. They embody the magic school of enigmancy, and they have a pretty wide variety of attacks in their arsenal. The order of their first three phases is also randomized, so while on one run you might fight their sword phase first, on another you'd fight their staff phase.
* CoolSword: Wields one for one of their phases to primarily perform melee attacks with, as well as summon more swords to fling at you. After being defeated, this is half of the weapon they drop, "Sacred Arms".
* DoppelgangerAttack: The Warden can split themself into multiple copies for some of their attacks, as well as create copies of their sword/staff.
* GodzillaThreshold: They only whip out their [[TimeStandsStill time magic]] on their fourth and final phase on Tier-4, presumably out of desperation.
* TheHeart: Is implied to have served this role for TheOmniscientCouncilOfVagueness if their MonsterCompendium FlavorText is anything to go by, and when you meet them in-game, [[ReluctantWarrior they don't enjoy having to fight you.]]
* KilledOffForReal: Defeating Tier-4 Warden results in them dying, as opposed to defeating them at a lower tier, which [[ScrewThisImOuttaHere merely causes them to escape]] and boot you out of the Temple.
* KingMook: Is this to enigmancers, resembling a larger version of them.
* LoadBearingBoss: A variation — defeating Tier-4 Warden causes the seal holding [[EldritchAbomination Chaosgod]] to break.
* MagicStaff: Wields one for one of their phases, mainly using it to fire various forms of lasers at you. After being defeated, this is the other half of Sacred Arms they drop.
* OptionalBoss: Is fought in the completely optional Temple floor.
* OurMagesAreDifferent: Seemingly has a body composed of question marks under their robe, and attacks you with swords, staves and runes made out of more question marks.
* RazorWind: One of their sword attacks has them creating SwordLines that slice through the air at an angle, presumably from how fast they swing the sword.
* ReluctantWarrior: They don't really want to fight you, and they're only doing so to prevent [[EldritchAbomination Chaosgod]] from escaping.
* RunicMagic: Wields a ring of runes shaped like question marks for one of their phases, using them to fire bullets at you from unusual angles.
* ScrewThisImOuttaHere: Defeating Warden below Tier-4 causes them to escape, leaving behind their [[CoolSword Sacred]] [[MagicStaff Arms]] for you to use.
* SequentialBoss: Depending on the Warden's tier when you fight them, you'll have to contend with up to [[MultipleLifeBars four Life Bars]], not to mention Chaosgod coming directly after them.
* SuperSpeed: One of runic phase attacks involves them quickly accelerating at high speed all across the top of the screen while shooting out bullets.
* TalkToTheFist: Humorously, you can skip their intro dialogue by just attacking them.
* TimeMaster: If you manage to get to phase 4 of Tier-4 Warden, they'll gain the ability to freeze time in conjunction with their other abilities, utilizing this to add bullets in the middle of their attacks, and even redirect their swords for one attack in particular.
* WaveMotionGun: During their staff phase, they can channel multiple staves together to fire a ridiculously massive beam downwards that pushes them off the screen from the force.
!!Chaosgod
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/chaosgod.png]]
* AttackItsWeakPoint: After dealing sufficient damage to it, it'll reveal its eye-shaped core, which must be shot at to deal real damage to them.
* DePower: If you enter the fight with a runic weapon, Chaosgod will simply break it, reducing you to using your starting peashooter. You can do this for yourself if you grab the Grasp of Entropy that can drop after defeating Chaosgod, allowing you to NoSell the Machine's runes.
* EldritchAbomination: Most likely neither undead nor mech nor construct nor mage nor creature. All it resembles is a huge, vaguely skeletal looking figure with a large eye-shaped core concealed in its chest that has the power to summon black holes and explode stars. Its core also counts, seemingly having discarded the rest of its body and grown sharp wing-shaped structures instead.
* GodOfChaos: Practically its name — it's heavily implied to embody the [[PrimordialChaos spatial entropy]] of the universe.
* LastDitchMove: When you seemingly defeat it, it'll attempt to fling black holes at you in an attempt to [[TakingYouWithMe take you with it]] before getting sealed up again.
* NiceJobBreakingItHero: If you defeat the Tier-4 Warden, you free it. {{Averted}} if you manage to defeat it and seal it back up, or better yet, destroy its core and [[KilledOffForReal kill it off for real]].
* PhysicalGod: Possesses immense power, has a name ending with "-god", and is physically fought after the Tier-4 Warden.
* ThePowerOfTheSun: Of a sort — you and Chaosgod appear to be flying right above the surface of the sun for the fight, and it physically explodes several stars in the background to rain down fire upon you.
* PowerOfTheVoid: It attempts to fling {{Unrealistic Black Hole}}s at you upon being defeated. If you get caught in one, you are forced into fighting its core.
* PyrrhicVictory: If you decide to fight and defeat its core, you'll have destroyed Chaosgod permanently, [[AndIMustScream at the cost of being trapped in the void forever]].
* SealedEvilInACan: Was sealed by the Warden long ago. Upon [[KilledOffForReal killing off the Warden for real]], it is freed from its prison.
* SequentialBoss: Not counting the fact that you fight it immediately after defeating the Warden, it has MultipleLifeBars that must be depleted, and after defeating it, you can optionally extend the fight for even longer by fighting its core.
* StuffBlowingUp: One of its attacks involves ''blowing up several stars in the background''.
* {{Superboss}}: Uniquely on par with ''[[UnlockableDifficultyLevels Mono]][[TrueFinalBoss lith]]''! You have to beat a floor 4 boss with at least a 2.5x ScoreMultiplier to access the Tier-4 Temple, light up every torch in the starting room by finding and defeating all four minibosses on the floor, and finally defeat Tier-4 Warden to get a shot at fighting Chaosgod.
* TakingYouWithMe: If you defeat it, it'll attempt to take you with it into the void. You can flip this on it by defeating its core, destroying it permanently.
* VictorGainsLosersPowers: If you manage to defeat it without being pulled into its prison, it'll drop one of two unique weapons for you to pick up and use — a runic weapon named Grasp of Entropy, or a sword named Edge of Reality — both presumably infused with Chaosgod's power.
* WaveMotionGun: A short-lived one, but one of its attacks is to blast a cone-shaped laser directly beneath its head.
* WhiteAndRedAndEerieAllOver: Though its stronger attacks give it some [[StealthPun shades]] of RedAndBlackAndEvilAllOver.
[[/folder]]
----
[[Characters/StarOfProvidenceEnemies Enemies]] | '''Bosses'''\\
]] -]]]
'''Due to the nature of ''Star of Providence''[='s=] gameplay and lore, there are no spoiler tags on this page.'''
Click [[Characters/{{Monolith}} here]] for player characters and [=NPCs=].
----
[[folder:Excavation]]
!!Chamberlord
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/chamberlord.png]]
* ArcSymbol: The background of its fight looks like two overlapping squares with a circle in the middle.
* BadBoss: If too many of its Chamberheads are left alive, it performs a unique attack that destroys them.
* FlunkyBoss: Sporadically flings out Chamberheads towards you. When you get its health low enough, it spawns four invincible Chamberheads that remain until it's defeated.
* KingMook: To the Chamberhead enemies.
* SinisterGeometry: Like the smaller Chamberheads, it's diamond-shaped.
* TurnsRed: When its health gets low, it spawns four invincible Chamberheads and starts sending out two slowly rotating streams of bullets.
!!Forgotten Ringleader
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/ringleader_2.png]]
* BodyOfBodies: A variant; the Ringleader is actually an amalgamation of many ghosts, and they come spiraling out of its body when it is defeated.
* EvilLaugh: The Ringleader giggles at the start of the fight, and continues to giggle whenever it manages to land a hit on you.
* FlunkyBoss: The biggest example of this out of every boss in the game, summoning ghosts en masse for literally all of its attacks.
* KingMook: A big version of the common ghost enemy.
* OurGhostsAreDifferent: A large circular grinning ghost made up of myriad smaller ghosts.
* SpectacularSpinning: The [[StealthPun Ring]]leader spins ghosts around it for most of its attacks. In particular, one of its attacks has it send a circle of ghosts outwards that then start spinning at high speed while shooting bullets outwards, forcing you to stay inside the ring close to the Ringleader.
!!Guardian
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/guardian_32.png]]
* AnimatedArmor: Specifically animated by the ghost residing inside of it.
* BeamSpam: On Hard Mode, it constantly fires lasers downwards while positioning itself over you. Additionally, it also gains an attack where it rains down lasers on you from the top of the screen.
* CarryABigStick: Primarily attacks by slamming down its mace, creating bursts of bullets.
* DeathFromAbove: On Hard Mode, it gains an attack where it barrages you with lasers from above you.
* DegradedBoss: From the Sanctum onwards, weaker versions of it can spawn as regular enemies with less health and only the mace-smashing attack.
* FlunkyBoss: Has a rare attack where it summons lance-wielding ghosts from the sides of the screen that cross over, leaving a trail of projectiles behind them.
!!Grinder
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/grinder_6.png]]
* BladeBelowTheShoulder: It has razors where its hands would otherwise be.
* ClockPunk: Specifically the background of the fight, which features numerous spinning gears.
* DeadlyDisc: Grinder's whole bread and butter. It has one at the end of each of its arms that it uses for its attacks.
* EnhancedPunch: Can attempt to punch you with one of its razor-hands. On Hard Mode, the punch also sends out projectiles.
* GiantHandsOfDoom: Well, more so giant razors of doom.
* HeavilyArmoredMook: Sorta — its razors block most weapons, requiring you to wait for an opening to attack it, or otherwise position yourself creatively.
* OurMagesAreDifferent: This one has razors for hands.
[[/folder]]
[[folder:Archives]]
!!Behemoth
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/behemoth_3.png]]
* ArcSymbol: A sigil resembling [[spoiler:Monolith]] can be seen etched onto it.
* DynamicEntry: It introduces itself by ploughing in through the top of the screen, running over and damaging the player ship should they be in the way.
* TankGoodness: It's a big ol' tank.
* TurnsRed: See right below.
* WaveMotionGun: After losing enough HP on Hard Mode, it starts firing a constant laserbeam that remains until it's defeated.
!!Presence
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/presence_6.png]]
* {{Blackground}}: This boss is fought in complete darkness.
* FacelessEye: The only feature of it that can be seen is its eyeball.
* FlunkyBoss: It disappears to summons Mooks as it loses intervals of health, and reappears once they've been dealt with.
* NothingIsScarier: It's unclear whether it's just an eyeball, or if there's more to it that's hidden in the darkness.
* TeleportSpam: It does this in an attempt to get you to misfire. However, it doesn't attack while doing this.
!!Daemon
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/daemon_5.png]]
* EvilLaugh: It lets a deep one out every time it summons enemy mages.
* FlunkyBoss: At the start of the fight, it summons a pair of Electromancers followed by a pair of Stormlashes, which must be defeated before it can be properly attacked.
* GreenAndMean: It's green and it's...
* {{Jerkass}}: ...described in the MonsterCompendium as "malicious and abrasive even before this whole mess began".
* LivingProgram: Its body seems like a [[OurMagesAreDifferent magical]] projection from the screen in the room.
* LosingYourHead: On Hard Mode, its body explodes after losing enough health, leaving its head to float around with a new attack pattern.
* PlayingWithFire: Creates pillars of fire that surge across the screen and vomits large quantities of fire onto your ship.
* StationaryBoss: Its targeted head doesn't move at all, except in Hard Mode.
* TurnsRed: See LosingYourHead above.
!!Charlie
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/charlie_6.png]]
* KingMook: It's one to Skullies, particularly the variant of them with the OneWayVisor.
* FlunkyBoss: It spawns Skullies throughout the fight. On Hard Mode, it can also spawn the UndergroundMonkey variants of them.
* FlyingFace: It's a giant floating mechanical skull.
* OneWayVisor: It sports one of these, similar in appearance to one of the Skully variants. On Hard Mode, it's capable of firing a giant laser beam. Upon being defeated, it loses it.
* TurnsRed: See right below.
* WaveMotionGun: After taking enough damage on Hard Mode, it'll start firing giant laser beams out of its OneWayVisor along with a large quantity of bullets.
[[/folder]]
[[folder:Maintenance System]]
!!Armor TAC
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/armortac.png]]
* CognizantLimbs: The ends of its limbs can individually be shot, though "breaking" them only gives you scrap and prevents the spiky balls from dealing CollisionDamage.
* DynamicEntry: It introduces itself by dropping from the top of the screen, attempting to crush your ship.
* NotQuiteDead: After being defeated, its limbs blow up and it falls down off the screen... before rising back up for a second phase.
* SequentialBoss: Once its arms fall off, it's revealed to have its own pinch mode without them.
* SpiderTank: It uses its four limbs to crawl on the sides of the walls.
* VictoryFakeout: After you've depleted its first health bar, the fight isn't quite over yet.
!!Devourer
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/devourer.png]]
* AttackItsWeakPoint: Its core in its second phase must be destroyed to end the fight.
* AttackOfThe50FootWhatever: On par with Firewall for ''largest foes in the game'', its mouth reaches from the top of the screen to the bottom, and its body seems to stretch on infinitely in length.
* BadVibrations: Before the fight begins, the screen starts rumbling with some dust falling from above, and then this thing bursts through the wall on the ''left'' of the screen.
* BloodyMurder: Occasionally, its jaws will shudder before vomiting a barrage of blood bullets.
* EyesDoNotBelongThere: Floating disconnected eyes periodically appear between its jaws.
* GoForTheEye: In its first phase, its eyes must be shot to damage it.
* MoreTeethThanTheOsmondFamily: In addition to the teeth contained in its gaping maw, the [[ExaggeratedTrope entirety of the inside of its digestive system is lined with teeth]].
* SandWorm: Though more of an underground sewer worm.
* SequentialBoss: Once the "eyes" are damaged enough, you take the fight to this boss's core.
* SwallowedWhole: After breaking its eyes, it lunges forward to swallow your ship.
* TacticalSuicideBoss: Said swallowing backfires on it as it allows its core to be targeted and damaged.
!!Ice Wyrm
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/icewyrm.png]]
* CyberCyclops: Once the true form of its head is revealed.
* AnIcePerson: It launches icicles and frost-like bullets at you.
* IceQueen: {{Implied|Trope}} to be of a non-defrostible variety, "ranked dead last in dateability".
* LegendaryCarp: It's said to have once been a fish that leapt to the top of a waterfall.
* SegmentedSerpent: It's composed of multiple segments that can individually be broken to limit its attacks, except on Hard Mode, where doing so gives them new attacks. Piercing weapons like the Drill can do massive damage against it as a result.
* StalactiteSpite: It can form stalactites from its body and drop them onto your ship.
* TearOffYourFace: The ice-made "mask" that appears to be its face is lost once it TurnsRed.
* TurnsRed: Once it loses half of its health, it shoots bullets less often and spends much of its time quickly chasing your ship.
!!Fish
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/fish_9.png]]
* AnimalMecha: It's a mech shaped like a fish.
* ADogNamedDog: What's the name of the fish mecha? Fish.
* DynamicEntry: It introduces itself by swimming from the left of the screen in an attempt to hit you.
* FlunkyBoss: Hordes of smaller fish swim through the arena, and a wave of Blastcores make an appearance for one of its attacks.
* KingMook: To all of the robotic fish found throughout the Maintenance System.
* UnderwaterBossBattle: It can periodically change the water level in its arena, submerging your ship.
[[/folder]]
[[folder:Bellows]]
!!Reactor
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/reactor.png]]
* CoresAndTurretsBoss: The Reactor Core fight has five stationary targets that can also shoot at you.
* FlunkyBoss: It periodically opens one of its hatches to release a swarm of Crazy Ghosts, and when its brought down to half HP it releases two Heavy Sentinels.
* ReactorBoss: The Bellows' reactor that you could have to fight as its main boss.
* ShieldedCoreBoss: In the Reactor Core fight, the "canisters" in the corner must be broken before the main core can be damaged.
* ShockAndAwe: It frequently rains down electric beams across the screen.
* StationaryBoss: Bolted to the top of the room, it doesn't move at all.
* TacticalSuicideBoss: {{Inverted|Trope}}. Its eye is closed while any Heavy Sentries are active, rendering it invincible.
* VictoryFakeout: After defeating it on Hard Mode, you leave the floor, expecting to head down to the Sanctum like usual... only to enter a new room and see "REACTOR CORE".]]
!!Ordinator
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/ordinator.png]]
* FlunkyBoss: The living blocks used in a certain attack eventually turn into Blazing Skullies.
* GiantHandsOfDoom: It creates fiery blasts with them.
* LosingYourHead: After taking enough damage its head gets destroyed, causing it to go berserk.
* PlayingWithFire: Naturally as the head of the school of pyromancy, it barrages your ship with fire.
* RobotWizard: It's robotic underneath its robes, best shown when you [[LosingYourHead blow its head off]].
* TurnsRed: Once [[LosingYourHead its head falls off]], enormous jets of flame erupt to the sides of the screen while it shoots bullets spreads at you.
* TyrantTakesTheHelm: Is implied to have taken control of the OmniscientCouncilOfVagueness, and attempts to wield the Power Eternal.
!!Firewall
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/firewall.png]]
* DynamicEntry: It first appears firing several jets of flame.
* GeniusLoci: Described by Kleines as "more of a location than a creature".
* PlayingWithFire: It spews flame from all over itself.
* PunnyName: Firewalls are a kind of computer security program.
* TurnsRed: Once it's damaged enough, it starts firing large jets and balls of flame from near the top of the screen.
!!Nightmare
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/nightmare_4.png]]
* AngelicAbomination: Genesis resembles an abstract angelic construct, in contrast to [[EldritchAbomination Oblivion]].
* BloodyMurder: Oblivion sprays out large quantities of blood bullets for some of its attacks.
* CombinationAttack: They co-ordinate their attacks during phase three.
* DualBoss: During the short-lived, Hard-difficulty-exclusive third phase.
* EldritchAbomination: Oblivion is a large oval "portal" that houses a giant eyeball that can shoot out copies of itself and also turn into a gnashing mouth, and it can summon onslaughts of hands with eyeballs in their palms from the portal.
* EnemyCivilWar: They don't get along with each other very well, which is shown when Oblivion ''devours'' Genesis after it's been defeated.
* EnemyMine: Though they don't like each other very much, they're willing to work together to defeat your ship in Hard Mode.
* EyesDoNotBelongThere: The hands that Oblivion summons have eyes in their palms.
* FacelessEye: Oblivion's most distinctive feature is its massive eye, which sometimes transforms into a [[MoreTeethThanTheOsmondFamily toothed mouth]]. Additionally, it can create copies of it that shoot at your ship.
* GiantHandsOfDoom: Oblivion summons hands ''en masse'' for its attacks, which have [[EyesDoNotBelongThere eyes in them]].
* NotQuiteDead: In Hard Mode, Genesis gets spit out of Oblivion in phase three, albeit heavily chewed up.
* SequentialBoss: The two different entities are fought separately in one battle.
* ShoutOut: The two entities that compose Nightmare have the same names as [[VideoGame/JenkasNightmare the halves of another boss named "Nightmare"]].
* VictoryFakeout: When Genesis is defeated, it is swallowed by the enemy you fight next, Oblivion. In Hard Mode, Oblivion later spits out a half-chewed Genesis and the two are fought together.
[[/folder]]
[[folder:Sanctum]]
!!Overlord
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/overlord_9.png]]
* BeamSpam: They have a habit of shooting fast-moving white lasers all over the place, and one of their attacks in their second phase involves them repeatedly trying to jump to align with you horizontally before firing a giant laser straight down.
* {{Blackground}}: The background for the fight is pitch-black — until they transition to their second phase, that is.
* BloodyMurder: They have an attack in their second phase that can only be described as a blood shotgun.
* CoolMask: Wears an orange one. They lose it on Hard Mode.
* CyberCyclops: On Hard Mode, a menacing red eye takes the place of where their mask used to be.
* DeathFromAbove: During their third phase, one of their attacks is to spawn multitudes of blue bullets that rain down.
* DidntNeedThoseAnyway: They lose parts as each phase is beaten — large bits of machinery keeping them tethered to the ceiling for their first phase, and their "legs" for the second. However, they keep fighting you with their remaining weaponry.
* DiscOneFinalBoss: Overlord is the final boss you'll fight on a run at first, but defeating them will allow you to obtain the seals on future runs, ultimately allowing you to progress further beyond.
* EmergingFromTheShadows: At the start of the fight, they slowly emerge from the black background until they're fully visible.
* FallenHero: Implied with their MonsterCompendium entry that they failed in their duty and became a guardian of floor 6.
* FinalBoss: In any run of the game prior to accessing the forbidden levels of the facility, they are this trope proper.
* GateGuardian: They guard the gate to floor 6, though you'll still need all the seals to make it through proper.
* HumongousMecha: Resembles one, particularly for their second phase when they're detached from the ceiling and start jumping around on their legs.
* MoreDakka: Possesses an impressive arsenal of armaments with which to unleash BulletHell on you with.
* SequentialBoss: Has three individual phases that must be fought without any breaks in-between.
* ShouldersOfDoom: They have a pair of weapon arrays that resemble these.
* WakeUpCallBoss: By far the most difficult opponent you'll have fought at this point in the game, to defeat them you'll have to contend with MultipleLifeBars and an overwhelming amount of BulletHell, so they're a good indicator of what's to come in Floor 6.
[[/folder]]
[[folder:Reward Bosses]]
!!Both of them
* HoldTheLine: The main mechanic of each fight is that it ends automatically after a period of time, but the more damage is done to the boss during that timeframe, the more rewards it drops.
* OptionalBoss: They can be fought on any floor, but doing so is not required to progress.
** Microcore is found in some shortcuts and must be interacted with to start the fight.
** Trespasser appears from a portal that spawn after breaking one of certain breachstones.
* TimeLimitBoss: {{Inverted|Trope}}; each fight ends after enough time passes.
!!Microcore
[[quoteright:120:https://static.tvtropes.org/pmwiki/pub/images/20220112213327_1.jpg]]
* AttackDrone: It spawns smaller versions of itself as additional units for some of its attacks, though they despawn automatically after a short bit.
* ConfusionFu: It has a wide pool of attack patterns that it randomly picks four from to use in a random order when it's fought.
* SchmuckBait: Once you approach the inactive core, warning signs spawn and raise an alert. Be sure not to ignore those...
* WeaponOfMassDestruction: Described as such in the MonsterCompendium, it was stowed away in a shortcut room.
!!Trespasser
[[quoteright:322:https://static.tvtropes.org/pmwiki/pub/images/20220112213332_1_8.jpg]]
* EldritchAbomination: A huge horned one-eyed creature -- originating from the void -- vaguely resembling a spider that shoots out spike-tipped tentacles that grow additional eye-shaped objects on them.
* GoForTheEye: Not its main eye, but eye-looking weak spots periodically appear along its tentacles that must be destroyed to damage it.
* LuckBasedMission: Getting this thing to show up in the first place is one, as the only way to get it to spawn is a 10% chance from breaking a breachstone.
* NonMaliciousMonster: According to the MonsterCompendium, it's not necessarily malicious, just yearning for a stability that its realm rarely provides.
* OurMagesAreDifferent: While it's very unclear why, this bullet-spraying, vaguely spider-like being counts as one.
[[/folder]]
[[folder:Seal Bosses]]
!!Special Offer
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/specialoffer.png]]
* AdamSmithHatesYourGuts: {{Parodied| Trope}}. This boss fight is the result of Bloke trying to force you to pay 1 million debris for one of the seals and requiring Null to "haggle" with him to get a reasonable price by shooting the seal while avoiding his mech's attacks. Not even ''Kleines'' is that greedy, considering he sells a seal for ''just'' 100k debris.
* BallisticDiscount: Literally — you have to shoot the seal to lower its price enough for you to grab it.
* DoYouWantToHaggle: Bloke has a strange idea of this trope; see above.
* FingerGun: Bloke can shoot projectiles and lasers from his mech's hands.
* GiantHandsOfDoom: Bloke's mech attacks you with these, mainly using them to punch and [[FingerGun shoot bullets.]]
* HumongousMecha: Bloke pilots one for the fight, presumably built from all the debris you've given him. Curiously, it resembles Null.
* InstantBandages: Humorously, after defeating him, in future shops, he'll appear to have a bandaged head.
!!Renegade
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/renegade_2.png]]
* AmbiguouslyEvil: They once defected from the OmniscientCouncilOfVagueness and took a seal for themself. In the present, they offer you [[DealWithTheDevil strange deals]] throughout the facility. They'll also fight you if you try taking their seal, but they likely know what'll happen if you get all the seals and make it to the end of the facility, and they're trying to stop that.
* BossBanter: If you manage to defeat them, they'll urge you to let go of the past.
* DeathFromAbove: For the last part of the fight they'll start raining down bullets from the ceiling, giving the impression that they're collapsing the room to stop you.
* DefectorFromDecadence: They used to be part of the OmniscientCouncilOfVagueness at some point in the past, but forcefully defected from them and likely stole a seal for good measure, hence their name.
* DesperationAttack: In the middle of the fight, they pause their typical attack patterns to fire one of two patterns of powerful bullets from themself.
* LivingStatue: If you accept the deal to face death, they will come to life to fight you.
* SchmuckBait: One of their deals is to obtain a seal, but "face death." If you're unprepared, you will get what you expect from it if you take it.
* StationaryBoss: Even while fighting you, they don't move around.
* TurnsRed: Near the end of the fight, they will start raining bullets from the ceiling.
[[/folder]]
'''Major unmarked spoilers below!'''
[[folder:True Final Bosses]]
!!The Machine
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/themachine_4.png]]
* AmazingTechnicolorBattlefield: The red and black patterned background of Floor 6 scrolls by upwards rapidly during the last phase of the fight.
* ArcSymbol: Its final form's prongs are of asymmetric length once one of them is partly broken off, reminiscent of the shape of the facility.
* BackgroundBoss: It's rendered behind your player ship, though the bullets it shoots out spawn on the foreground.
* BackToFront: In terms of the order the ships fight it. Chronologically, ??? fights it first, followed by Overlord, before Null finishes it off, though you see these fights play out in reverse order in-game.
* BeamSpam: Is fond of summoning runic circles around the room that fire lasers at you. In fact, this is its only attack during its slab phase.
* BoomerangComeback: One attack in its second and last vs.-Null phases is to fire streams of bullets that shortly start flying backwards.
* ClimaxBoss: A mighty guardian of the Power Eternal. Defeating it truly completes Null's run and unlocks the road to further revelations about the game's story.
* EarlyBirdCameo: The first form the player encounters is seen up-close in the pause menu at the Sanctum and the floor below.
* EldritchStarship: Has the appearance of one, resembling a gigantic spaceship with a sinister looking eye and jagged parts resembling demonic horns.
* GlassCannon: The last sub-boss of Database is this, being an infant version of this boss. It lasts only as long as one phase of its current self, but as a sub-boss that's barely bigger than the PlayerCharacter, it can deal double damage while its grown self cannot.
* GoForTheEye: Its eye is the only part of it that the player can hit in most of its forms. Originally, it had the appearance of a white circle, though after the fight with Overlord, it's broken to reveal a more organic looking one.
* HeadsIWinTailsYouLose: Without the glitched cartridge that grants access to Nowhere, ??? gets destroyed regardless of the outcome of their fight against this boss. Narrowly {{subverted|Trope}} with Overlord, however, if the boss Overlord is interpreted as the result of the player Overlord claiming the Power Eternal (another ??? ship [[HeroicSacrifice gives up its life]] to save Overlord from the Machine's cutscene attack).
* KaizoTrap: Once its health is depleted in either pre-Null form, it fires yellow lazer blasts in the top half of the screen that can still damage (or even destroy) your ship.
* TheMonolith: The slab it's trapped in resembles one, funnily enough more than the boss that's actually named after it.
* NoNameGiven: Introduced with eight scrambling letters in place of its name, and otherwise called "Unknown". The only instances where it is called by name are the Hard difficulty end credits, a report of the player defeating it and claiming Power Eternal, and its practice fight preface once Monolith has been defeated before as well.
* NonIndicativeName: Although its name and the initial NoNameGiven are both rather intimidating, this boss is not a mech, but a [[AnimateInanimateObject construct]].
* PostDefeatExplosionChain: Weaponized [[HeadsIWinTailsYouLose against ???]], intentionally or otherwise.
* RouteBoss: Different forms of it are fought when you play as Overlord or ??? at Normal difficulty. These two pre-Null versions are very similar to each other, and they both have different attacks from when it is fought by Null. It is also this as a sub-boss of Database.
* SequentialBoss: It initially appears as a giant slab with a rune in the center of it that must be shot at. After damaging it enough, the rune breaks open, revealing a menacing eye. After shooting the eye enough times, the slab seemingly descends downwards before cracking wide open, finally revealing the spaceship-like form hidden within the slab. The Machine could also be considered a sequential boss in that it is [[ExaggeratedTrope fought across the span of three characters]]. Initially, the Chaos ship first encounters and damages it, followed by the Overlord ship fighting and damaging it further, causing it to seal itself in the slab form that you first fought as Null.
* StationaryBoss: Its first two forms don't move at all. Averted for the versions fought by ??? and Overlord, as well as it as a sub-boss of Database.
* TrueFinalBoss: Fought below the seal at Normal difficulty.
* TurnsRed: Two instances in the vs.-Null final phase:
** A {{downplayed| trope}} example: when the health bar is below half, this boss's triple WaveMotionGun attack is replaced with four beams, and its {{roboteching}} spiral attack has more bullets per volley.
** When the boss is at critical health, the background and foreground brighten, and the Machine moves near the top of the screen for a set of two new attacks.
* VictoryFakeout: That pillar you seemingly destroyed seemingly falls down… and then returns as its original (yet battle-torn) spaceship-esque form and gives Null quite a run for their money!
!!Monolith
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/monolith_2.png]]
* AngelicAbomination: Its bright glowing wings and white color scheme give it an angelic appearance.
* AntagonistTitle: This boss is the eponymous figure of the game. Not the facility. Not the Machine. THIS.
* ApocalypseHow: Its MonsterCompendium entry indicates that a certain being, similarly to Null, obtained Power Eternal and spent their last moments destroying the facility and most living society around it (likely akin to the mirror practice boss portrait).
* ArcSymbol: It [[DeadlyUpgrade looks very similar to]] the parts of upgrade terminals that encapsulate the player ship.
* BossRemix: The song that plays for the first part of the fight is a remixed version of the song that plays for the tutorial fight — fitting since the tutorial fight was Null sparring with D-13.
* ConfusionFu: It has a variety of fast-moving attacks under its belt, and its first two phases have '''no set order of attacks''', making it a very unpredictable foe.
* CueTheSun: After taking enough damage, it ascends high enough for the rising sun to be visible as a backdrop to the last part of the fight.
* DuelingPlayerCharacters: It and D-13 are the first two ships you play as in the game.
* FaceHeelTurn: Null turns on D-13 after taking the Power Eternal.
* FinalBoss: Fought below the seal at Hard difficulty, at a point where the sixth floor's existence is obvious.
* HighAltitudeBattle: A ways into the fight, it busts through the ceiling of the facility, taking the fight to the sky above the city. Furthermore, the screen expands vertically for the fight to increase the amount of room you can fight in, changing the appearance of parts of the UI like your HP.
* HistoryRepeats: Stated in its MonsterCompendium entry. It is unknown if it speaks of a scenario in which D-13 failed to stop Null as Monolith, or if it occurred far in the past.
* MarathonBoss: Despite only having a single health bar, it may very well have the highest health pool out of anything in the game. You're gonna be fighting this guy for a while.
* MeaningfulName: It perfectly fits an alternate definition of the word "monolith": a sizable and impersonal structure that acts as a singular body of '''power'''.
* MirrorBoss: To an extent — many of the attacks it uses are based off the weapons you can find in the game.
* PowerAtAPrice: The price being Null's sanity, evidently.
* PowerGivesYouWings: It's gained several wings that are seemingly made of light.
* RouteBoss: On Hard Mode, it takes the place of The Machine, showing up directly after when The Machine would otherwise appear.
* RunicMagic: It has a plethora of runes constantly orbiting around it which it uses for many of its attacks.
* SadBattleMusic: Melancholic tones of its battle themes set them apart from the rest of the game's soundtrack.
* SuperpoweredEvilSide: The Power Eternal has made Null very powerful, and very insane.
* TitleDrop: If it being a powered-up version of your first player ship didn't tip you off, it sharing a name with the game should make it clear that it's a big deal.
* TragicMonster: The result of Null having succumbed to Power Eternal and getting turned into a construct whose sole aim is to destroy.
* TrueFinalBoss: Of the story as a whole, fought near the very end of ''Monolith'''s timeline.
* WalkingSpoiler: The existence of this boss reveals what happened to Null after obtaining the Power Eternal.
* WithGreatPowerComesGreatInsanity: The Power Eternal has granted it immense power, as well as seemingly not recognising its former friend anymore.
!!Database
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/database_7.png]]
* AIIsACrapshoot: The database has been corrupted likely due to the influence of the glitched cartridge, and it attempts to "purify" the player ship when they find it.
* BloodyMurder: Certain Devourer eyes spawned by Omniscient explode into shotgun spreads of blood projectiles. While you fight Abyssal, said projectiles fall into the Devourer mouth when it [[VacuumMouth tries to suck you downwards]]. The infant Machine can also shoot radial bursts of these particles as one of its second sub-phase's attacks.
* BossBanter: When the player ship first encounters it, it welcomes them to the facility before noting that it's been corrupted, proceeding it to deem them a threat. After it's been defeated, it thanks the visitor for using the facility database.
* BossBonanza: Database summons three sub-bosses to fight in its stead over the course of the battle.
* ConfusionFu: Its main attacks are random, and it summons three out of eight different [[MixAndMatchCritters sub-bosses]] in a random order each time it is fought.
* DeathFromAbove: Abyssal, Phoenix Gunship, and Thaumaturge each have an attack that involves raining many bullets from the ceiling.
* EpicFlail: The sub-boss Iron Magus wields one, and it's fond of dropping it down and swinging it in a wide circular motion to catch your ship. It appears to be recreated from one of Armor TAC's limbs.
* {{Expy}}: Of [[VideoGame/TheTaleOfAlltynex ALLTYNEX,]] being a rogue MasterComputer CyberCyclops in a ShootEmUp. Additionally, one of the sub-bosses is a white winged figure with the ability to shoot out blades from its face and from the sides of the room, named [[VideoGame/HollowKnight "The Radiant"]].
* FacelessEye: One that's very reminiscent of [[Film/TwoThousandOneASpaceOdyssey HAL.]] One of the sub-bosses has one as well, Omniscient being Presence's eye surrounded by Chamberlord's vertices.
* FinalBoss: Gets demoted to this for those who seek it out in order to reach for higher and higher [[NumericalHard loop settings]].
* FireIceLightning: The sub-boss Thaumaturge utilizes this in its attacks. Presumably, fire and ice are taken from Daemon's head and Ice Wyrm's body segment, and lightning from Reactor's "eye".
* {{Flashback}}: The boss weaponizes this! During the last part of the fight, Database playbacks the creation of The Machine while your ship is caught in the midst of it, taking damage if they touch the bullets.
* FlashStep: Phoenix Gunship zips around this way.
* FlunkyBoss: Iron Magus and Late Knight summon ghosts as part of certain attacks. Omniscient also summons Devourer eyes for two of its attacks.
* HighTechHexagons: Most of its main form's attacks involve it generating these around the screen, which then fire off various bullet patterns.
* HoverTank: One of the sub-bosses, Phoenix Gunship, is a winged craft with parts taken from Behemoth, Overlord, and Monolith.
* InsistentTerminology: None of the sub-bosses are recognized as separate entities, so the death message for this fight is always "Ended by Database" (humorously, even if you die while fighting an amalgamation or the infant Machine).
* InstantDeathRadius: {{Inverted|Trope}}; one of the sections of the Infant Machine phase forces your ship to stay in a small circular zone around it while the area outside is bombarded by walls of bullets that are blocked by the zone.
* LosingYourHead: {{Inverted| Trope}}; Ordinator's head plops onto Guardian's torso when the player is introduced to sub-boss Iron Magus.
* MatrixRainingCode: Present in its portrait.
* MeaningfulBackgroundEvent: In the final phase, several mages are present in the background overlooking the fight — presumably they are the ones channelling the Power Eternal into the vessel you are fighting.
* MixAndMatchCritters: The sub-bosses created by Database resemble parts of other bosses mashed up together in creative ways — for example, Leviathan appears to be Fish with Charlie's visor grafted onto it, and Iron Magus is composed of Guardian's body with Ordinator's head sitting atop it, wielding a flail fashioned after one of Armor TAC's limbs.
* NumericalHard: The four main phases have increasing numbers of bullets or attacks in some of the attacks they share.
* OurMagesAreDifferent: Two of the sub-bosses, Iron Magus and Thaumaturge. The first is an armored mage that wields a flail along with fire magic, while the latter has an eye embedded in its neck-stump and carries Daemon's head and one of Ice Wyrm's body segments in its hands, enabling it to use various elemental magics.
* PlayingWithFire: Several of the sub-bosses, especially Iron Magus and Phoenix Gunship, are capable of this.
* SeaMonster: One of the sub-bosses is dubbed "Leviathan". It resembles Fish with Charlie's OneWayVisor.
* SequentialBoss: Counting its sub-bosses, it has a total of eight phases, [[ExaggeratedTrope and its final phase has four sub-phases of its own!]]
* SharedLifeMeter: Abyssal and the Devourer mouth both show signs of defeat once the former is hit enough.
* ShoutOut: It states that your ship is a "[[VideoGame/TheBindingOfIsaac Void]]-class threat", and right before the fight begins, it declares "[[VideoGame/{{Off}} Purification in Progress…]]"
* StationaryBoss: In its main form, it stays in place with its eye in the centre of the screen.
* {{Superboss}}: To fight this boss, you must find a secret cartridge, defeat the TrueFinalBoss at floor 6, and then venture throughout Nowhere.
* TacticalSuicideBoss: {{Inverted|Trope}} with Abyssal, which cannot be hit while the Devourer mouth shoots laser blasts from below.
* TeleportSpam: Omniscient, Abyssal, and Phoenix Gunship each do this for one or two of their attacks.
* TimeStandsStill: The infant machine can freeze the bullets getting sucked into it, though your ship's still free to move around, possibly causing it to run into the frozen bullets.
* VacuumMouth: The Devourer mouth of sub-boss Abyssal sometimes tries to suck you into it so you're low enough on the screen for it to bite you, all the while forcing you to dodge the [[BloodyMurder blood particles]] [[DeathFromAbove that fall from the ceiling]].
* WarriorUndead: The sub-boss [[StealthPun Late Knight]] appears to be Forgotten Ringleader encased in a suit of armour fashioned from Armor TAC.
* WaveMotionGun: Leviathan can fire a large beam that rains particles both in directions perpendicular to it and from where it hits the top of the screen.
* WreathedInFlames: The ghost knights summoned by Iron Magus use this very effectively, leaving fire bullets and trails everywhere if they aren't killed.
[[/folder]]
[[folder:Temple Bosses]]
!!The Warden
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/thewarden_6.png]]
* AuthorAvatar: Of the developer [=PureQuestion=].
* BossBanter: Before you fight them, they'll have some dialogue about [[ReluctantWarrior how they wish they could've met you under better circumstances]], and if you defeat their Tier-4 version, they'll tell you not to let [[EldritchAbomination it]] free before [[KilledOffForReal expiring.]]
* ConfusionFu: Well, they're literally made out of question marks. They embody the magic school of enigmancy, and they have a pretty wide variety of attacks in their arsenal. The order of their first three phases is also randomized, so while on one run you might fight their sword phase first, on another you'd fight their staff phase.
* CoolSword: Wields one for one of their phases to primarily perform melee attacks with, as well as summon more swords to fling at you. After being defeated, this is half of the weapon they drop, "Sacred Arms".
* DoppelgangerAttack: The Warden can split themself into multiple copies for some of their attacks, as well as create copies of their sword/staff.
* GodzillaThreshold: They only whip out their [[TimeStandsStill time magic]] on their fourth and final phase on Tier-4, presumably out of desperation.
* TheHeart: Is implied to have served this role for TheOmniscientCouncilOfVagueness if their MonsterCompendium FlavorText is anything to go by, and when you meet them in-game, [[ReluctantWarrior they don't enjoy having to fight you.]]
* KilledOffForReal: Defeating Tier-4 Warden results in them dying, as opposed to defeating them at a lower tier, which [[ScrewThisImOuttaHere merely causes them to escape]] and boot you out of the Temple.
* KingMook: Is this to enigmancers, resembling a larger version of them.
* LoadBearingBoss: A variation — defeating Tier-4 Warden causes the seal holding [[EldritchAbomination Chaosgod]] to break.
* MagicStaff: Wields one for one of their phases, mainly using it to fire various forms of lasers at you. After being defeated, this is the other half of Sacred Arms they drop.
* OptionalBoss: Is fought in the completely optional Temple floor.
* OurMagesAreDifferent: Seemingly has a body composed of question marks under their robe, and attacks you with swords, staves and runes made out of more question marks.
* RazorWind: One of their sword attacks has them creating SwordLines that slice through the air at an angle, presumably from how fast they swing the sword.
* ReluctantWarrior: They don't really want to fight you, and they're only doing so to prevent [[EldritchAbomination Chaosgod]] from escaping.
* RunicMagic: Wields a ring of runes shaped like question marks for one of their phases, using them to fire bullets at you from unusual angles.
* ScrewThisImOuttaHere: Defeating Warden below Tier-4 causes them to escape, leaving behind their [[CoolSword Sacred]] [[MagicStaff Arms]] for you to use.
* SequentialBoss: Depending on the Warden's tier when you fight them, you'll have to contend with up to [[MultipleLifeBars four Life Bars]], not to mention Chaosgod coming directly after them.
* SuperSpeed: One of runic phase attacks involves them quickly accelerating at high speed all across the top of the screen while shooting out bullets.
* TalkToTheFist: Humorously, you can skip their intro dialogue by just attacking them.
* TimeMaster: If you manage to get to phase 4 of Tier-4 Warden, they'll gain the ability to freeze time in conjunction with their other abilities, utilizing this to add bullets in the middle of their attacks, and even redirect their swords for one attack in particular.
* WaveMotionGun: During their staff phase, they can channel multiple staves together to fire a ridiculously massive beam downwards that pushes them off the screen from the force.
!!Chaosgod
[[quoteright:128:https://static.tvtropes.org/pmwiki/pub/images/chaosgod.png]]
* AttackItsWeakPoint: After dealing sufficient damage to it, it'll reveal its eye-shaped core, which must be shot at to deal real damage to them.
* DePower: If you enter the fight with a runic weapon, Chaosgod will simply break it, reducing you to using your starting peashooter. You can do this for yourself if you grab the Grasp of Entropy that can drop after defeating Chaosgod, allowing you to NoSell the Machine's runes.
* EldritchAbomination: Most likely neither undead nor mech nor construct nor mage nor creature. All it resembles is a huge, vaguely skeletal looking figure with a large eye-shaped core concealed in its chest that has the power to summon black holes and explode stars. Its core also counts, seemingly having discarded the rest of its body and grown sharp wing-shaped structures instead.
* GodOfChaos: Practically its name — it's heavily implied to embody the [[PrimordialChaos spatial entropy]] of the universe.
* LastDitchMove: When you seemingly defeat it, it'll attempt to fling black holes at you in an attempt to [[TakingYouWithMe take you with it]] before getting sealed up again.
* NiceJobBreakingItHero: If you defeat the Tier-4 Warden, you free it. {{Averted}} if you manage to defeat it and seal it back up, or better yet, destroy its core and [[KilledOffForReal kill it off for real]].
* PhysicalGod: Possesses immense power, has a name ending with "-god", and is physically fought after the Tier-4 Warden.
* ThePowerOfTheSun: Of a sort — you and Chaosgod appear to be flying right above the surface of the sun for the fight, and it physically explodes several stars in the background to rain down fire upon you.
* PowerOfTheVoid: It attempts to fling {{Unrealistic Black Hole}}s at you upon being defeated. If you get caught in one, you are forced into fighting its core.
* PyrrhicVictory: If you decide to fight and defeat its core, you'll have destroyed Chaosgod permanently, [[AndIMustScream at the cost of being trapped in the void forever]].
* SealedEvilInACan: Was sealed by the Warden long ago. Upon [[KilledOffForReal killing off the Warden for real]], it is freed from its prison.
* SequentialBoss: Not counting the fact that you fight it immediately after defeating the Warden, it has MultipleLifeBars that must be depleted, and after defeating it, you can optionally extend the fight for even longer by fighting its core.
* StuffBlowingUp: One of its attacks involves ''blowing up several stars in the background''.
* {{Superboss}}: Uniquely on par with ''[[UnlockableDifficultyLevels Mono]][[TrueFinalBoss lith]]''! You have to beat a floor 4 boss with at least a 2.5x ScoreMultiplier to access the Tier-4 Temple, light up every torch in the starting room by finding and defeating all four minibosses on the floor, and finally defeat Tier-4 Warden to get a shot at fighting Chaosgod.
* TakingYouWithMe: If you defeat it, it'll attempt to take you with it into the void. You can flip this on it by defeating its core, destroying it permanently.
* VictorGainsLosersPowers: If you manage to defeat it without being pulled into its prison, it'll drop one of two unique weapons for you to pick up and use — a runic weapon named Grasp of Entropy, or a sword named Edge of Reality — both presumably infused with Chaosgod's power.
* WaveMotionGun: A short-lived one, but one of its attacks is to blast a cone-shaped laser directly beneath its head.
* WhiteAndRedAndEerieAllOver: Though its stronger attacks give it some [[StealthPun shades]] of RedAndBlackAndEvilAllOver.
[[/folder]]
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