Characters / ULTRAKILL: Bosses

ULTRAKILL Main Index
Regular Enemies | Bosses

Bosses

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Regular Bosses

V2

V2

Rank: Supreme Machine

A red combat robot not unlike V1 that seems to venture to Hell for the same purpose. The boss of Limbo and returns as the boss of Greed.

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• An Arm and a Leg: Loses an arm as a result of their first boss fight. An arm is all that remains of them after their second boss fight.
• Back for the Dead: V2 comes back for a rematch in 4-4, only to fall to their death at the end of the battle.
• Berserk Button: V2 has two requirements for their rage status, one of which only turns up in the second encounter. For the duration of their rage, they switch to their extremely aggressive red-wing mode:
  • In Clair De Lune, they flip out if V1 keeps their distance for too long. Oddly enough, punching them in this fight doesn't count as a +DISRESPECT bonus.
  • In Clair De Soleil, they become outraged whenever V1 punches them with their original arm, the Knuckleblaster.
• Can't Catch Up: After being defeated the first time V2 acquires a nailgun and learns to use coin shots, allowing them to replicate the tactics V1 used in their first battle. Unfortunately V1 has got stronger still in the meantime, acquiring a railgun as well as V2's old arm, meaning they still have a bigger arsenal.
• Coin-Targeting Trickshot: The rematch against V2 in 4-4 has them copy the player. This means they also can do coin trick shots, being able to deal hefty damage. This is used to show how much they have learned since the previous boss battle, along with being a test for the player to see if they can outperform the boss by making them have to shoot the coins thrown in the air before V2 beats them to it. Also, while they can shoot coins in the first boss battle and cause them to ricochet, they won't outright do so and can only be on accident, such as if the player just so happens to throw a coin right in front of V2 as they are shooting.
• Color-Coded for Your Convenience: V2's wings change colors depending on their behavior. When V2's wings are red, they will try to stay close to V1 and constantly attack them with everything they have. When V2's wings are green, they will instead keep their distance and refrain from using their weapons as frequently. Yellow and blue wings both signal a middle-ground behavior between V2's aggressiveness with red wings and passiveness with green wings.
• Combat Breakdown: In their second appearance. During their second phase, in which both V1 and V2 are sliding down the pyramid, V2 can only dash when fought up-close, making landing attacks on them much easier.
• Cruel and Unusual Death: V2 meets their end after V1 knocks them out of the pyramid they were both fighting on and crushes onto the floor, leaving only their new grapple arm and a big puddle of blood.
• Cyber Cyclops: Just like V1, V2 has a large yellow singular eye on their head.
• Faux Affably Evil: Begins the first bout with them with a courteous bow, but has no intention of being honorable or level-headed when it comes to attacking V1.
• Forgot About His Powers: Despite having both the Knuckleblaster and later the Whiplash at their disposal, they never utilize either in their attack moveset.
• Fragile Speedster: Amongst Ultrakill's bosses and minibosses, they're one of the most mobile and evasive of the bunch, but they also have the least amount of health amongst them; they only have 40 HP in Act I compared to the Hideous Mass's 175, The Corpse of King Minos' 160, Gabriel's 100, or even the Prelude's Cerberus which has at least 80 for each instance. Even in Act 2, this continues: They only have 80 HP total, which is even less than Gabriel's rematch in 6-2, who still retains his 100 total HP from his last bout in 3-2.
• Gameplay and Story Segregation: Whilst the 1-4 terminal entry for V2 states that they were made with standardised plating due to durability being more important after the war, V2 has in fact, less health than V1 in practice, bearing 40 HP in Clair de Lune and 80 HP in total (50 during the first phase, 30 during the second phase) in Clair de Soleil, compared to V1's 100. However, close inspection of the data reveals that V1 only has 10 health, which is rendered as 100 in-game for the sake of readability, and in gameplay, they are much more fragile than V2 is, only managing to best their successor through superior maneuvering and aiming.
• Health/Damage Asymmetry: Justified; despite V1 and V2 using the same weapons, V2 is able to soak up way more damage than V1. This is because V2's armor is stronger, but at the cost of not having the same blood absorption that V1 can do.
• Hoist by His Own Petard: They use a few new tricks in their second encounter in the Greed layer, and both of them can be turned against them in different ways. Both counterstrategies are cited in V2's second terminal entry.
  • V2 periodically throws Marksman coins, interacting with them almost identically to how the player does. The sole difference is that the last coin in their ricoshot chain doesn't launch at the player immediately; before it does, it freezes in midair and flashes red for a brief moment. This gives V1 a chance to shoot V2's coins back at them, doing decent damage and earning the "Counter Ricoshot" bonus in the process. Meanwhile, if V1's slow with their coin shots, V2 can also perform Counter Ricoshots—but the same pause and red flash both occur for them, allowing V1 to counter their counterattack.
  • The nails from V2's nailgun attacks can be neutered completely with V1's Attractor magnets. As soon as the nails are attracted to a magnet, their ownership will transfer from V2 to V1, becoming completely harmless to the latter and, thanks to nailbombing, potentially dangerous to the former. Conveniently, the Attractor Sawblade Launcher can be found a few rooms before this fight, implicitly encouraging this tactic.
• Not the Fall That Kills You…: Averted. V2 attempts a second daring escape from V1 by sliding down the side of the Greed Pyramid, but V1 manages to knock them into the air in such a way that they instantly liquefy the second they hit a flat surface on the ground.
• Killed Off for Real: V2 tries escaping V1 in Clair De Soleil by sliding down Greed's biggest pyramid. However, when V1 follows and damages them enough, they're sent tumbling so hard that they sail into the air and splatter at the pyramid's base headfirst, leaving nothing behind but the Whiplash arm. If anyone thinks V2 somehow survives, their 2nd database entry makes it clear that V2 is already killed after their final defeat in Greed.]]
• Knows When To Fold Em: When V1 manages to beat V2 up enough in Clair De Lune, the escape, knowing they aren’t strong enough to face V1. They try to do this again in Clair De Soleil but V1 chases them and manages to kill them this time.
• Leitmotif: V2 is associated with a recurring soft guitar riff, which serves as the basis Versus during their fight in Clair De Lune and Duel for their fight in Clair De Soleil. While calm, the motif paints V2 as sinister and competitive, and it quickly gives way to heavy percussion, synths, and guitars as they start fighting.
• Lightning Bruiser: Shares their mobility and arsenal with V1, but their thicker and stronger armor plating makes them a Hell of a lot more durable.
• Mirror Boss: For the most part, V2's got access to your own tools, both weapons and movement techniques.
• No Plans, No Prototype, No Backup: V2's lore entry notes that neither they nor V1 reached mass production, so it's likely only a single model of either was ever built.
• Pint-Sized Powerhouse: They're as tall as V1, who's shorter than a Filth themself, but they're just as formidable as their predecessor.
• Slouch of Villainy: Begins the second fight with you lounging on a throne. Sadly you can't get a cheap shot on them while they're sitting.
• Superior Successor: To a degree. Superior durability gives V2 a wider range of tactical options in the short-term, but their lack of blood absorption leaves them vulnerable to being worn down.
• Turns Red: In 1-4, keeping your distance for too long enrages V2. In 4-4, hitting V2 with their original arm enrages them. While enraged, their move speed is increased drastically, outpacing even V1's dash-jumping speed, and they gain the ability to spam charged Piercer shots.
• Upgrade vs. Prototype Fight: V2 is the successor to V1, having superior armor plating at the cost of absorbing blood through contact. Despite the improved durability and having combat skills equal to V1's, V2 lost twice.
• Victor Gains Loser's Powers: In their 2nd database entry, V2 stole an arm from a nondescript robot they killed (implied to have been a Sentry), then modified it with scrap parts. V2 is on the receiving end of this trope twice, with V1 taking both arms at the end of each battle, including the new one.
• Villain: Exit, Stage Left: V2 flees at the end of the battle with them. They try this again in their rematch, but V1 pursues after them to make sure they don't come back.
• Wake-Up Call Boss: V2 is the game's first notable difficulty spike. They are a tough, mobile, hard-to-hit, and hard-hitting foe that tests the player's ability to not only aim well, but also avoid damage at the same time. Healing from V2 also requires knowing how to take advantage of the cooldown between V2's attacks.
• Winged Humanoid: Also like V1, V2 is a humanoid robot with yellow wings.
• Wings Do Nothing: Yet again, also like V1, V2's wings are used for anything but flight, such as sliding, dashing, and storing weapons.

Corpse of King Minos

Corpse of King Minos

Rank: Supreme Husk

^{Click here to see the parasites infecting him.}

The desecrated remains of King Minos, the former ruler of the Lust layer; a gargantuan husk that can only mindlessly seek sinners to punish. He serves as the boss of Lust.

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• Animal Motifs: Snakes, as shown by the serpentine parasites popping out of his eye-sockets in his 2nd phase. In a more subtle way, he snaked his arm into the subway tunnel to attack V1 before his proper boss fight.
• Astonishingly Appropriate Appearance: The basic shape of Minos' crown matches the appearance of a distant cityscape, evoking the urbanized Lust Layer that Minos ruled over when he was still alive.
• Attack of the 50-Foot Whatever: The Corpse of King Minos is the single biggest character in Act 1, and according to his terminal entry, he's involuntarily putting that size to use by tearing down his own city.
• Early-Bird Cameo: Before the fight with him in the "Court of the Corpse King," The Corpse of King Minos can be spotted in the background of every preceding Lust level. By "Death At 20,000 Volts," the corpse becomes aware of V1's rampage and begins observing them from afar, growing closer with each appearance until he finally confronts them personally.
• Giant Hands of Doom: The corpse uses his own hands to battle V1, and he attacks the robot even before the actual battle.
• Glowing Eyes: His eyes glow a ghastly white.
• Go for the Eye: Takes the most damage when struck in his glowing white eyes, even once parasites pop out of them.
• Humanoid Abomination: A massive humanoid Undead Abomination controlled by parasitic worms and can summon miniature black holes in his battle. When enough damage is dealt, the parasites pop out of his eye sockets.
• Lean and Mean: Despite his sheer size, the corpse is utterly emaciated, and without any goodwill left inside him, his sole instinct is to attack any sinners that cross his path.
• Leitmotif: "In the Presence of a King".
• Parasite Zombie: The only thing keeping Minos's body moving is the parasites within him.
• Punch Parry: Countering any of his colossal haymakers with the Feedbacker will stun Minos, and earn a +DOWN TO SIZE bonus to boot.
• Purple Is Powerful: The Corpse shares the black and purple scheme of the Lust Layer, and while his movement and attacks are slow, his attacks deal tons of damage, and he has tons of health. Even his black holes are also black and purple, and they can reduce V1's health to 1 point; otherwise, the black holes will kill them if their health is below 10 points. The color scheme is fitting, as Minos used to rule the Lust layer as The Good King until Gabriel killed him.
• Stationary Boss: The corpse stays in one spot throughout the battle with him in the "Court of the Corpse King," as he has V1 cornered in a room and has no reason to move.

Leviathan

Leviathan

Rank: Supreme Demon

^{Click here to see its heart.}

A titanic, serpentine demon that lurks in the ocean Styx. It serves as the boss of Wrath.

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• Achilles' Heel: The heart on its head is its weak point. Explosions are also deadly against it, not because it takes bonus damage from them, but rather the explosions reflect its Hell orbs back into its mouth, dealing massive damage.
• And I Must Scream: Its pulsing heart resembles an agonizing, humanoid mound of flesh, and it contains the countless souls of the Sullen who were absorbed into the Leviathan. The souls try to free themselves, but they're helpless since Gabriel struck the Demon down. If you climb onto its back and get close to its heart, you can hear never-ending screaming.
• The Assimilator: The Leviathan grows in strength and size by absorbing countless sinners into its body.
• Attack of the 50-Foot Whatever: The Leviathan's sheer length rivals the Corpse of King Minos' height, and it's big enough for V1 to ride on its back.
• Beast of the Apocalypse: According to its lore entry, the Leviathan is prophesized to appear at the end of the world, even though that already happened due to Killer Robots wiping out humanity and the rest of the world's surface life.
• Beast with a Human Face: Its head is a human's head devouring another human, and its underbelly has humanoid faces similar to the face of Hideous Mass.
• Body of Bodies: According to its lore entry, it's a titanic amalgamation of sinner bodies in a serpentine form.
• Breath Weapon: The Leviathan can breathe out a volley of Hell energy.
• Canon Immigrant: The game can be considered a very loose adaptation of The Divine Comedy, due to its portrayal of Archangel Gabriel, King Minos, The Centaurs (in the form of The Earthmovers), and Hell. Despite being one of, if not, the most well-known monster from The Bible, The Leviathan was never mentioned once in the poem, which is odd considering that the poem contains both Angels and Demons from Christianity existing alongside with mythological creatures from Classical Mythology.
• Dem Bones: The Leviathan has a skeletal appearance, thanks to its spine-like shell and its skull-like head.
• Dracolich: While not a proper dragon, The Leviathan is still close enough by being an undead Sea Serpent Demon, since its lore entry states that its body is formed from undead, despair-ridden spirits that lie motionless in the Styx's abyss, and its undead nature is strengthened by its skeletal appearance.
• Draconic Abomination: It's a wyrm-like Demon with a spine-like shell across its body, and Hideous Mass-like faces cover the underside of its belly. Look at its back closely and you can see arms grasping each other to form the body. Also skirts around Animalistic Abomination for being snake-like. According to its lore entry (which explicitly calls it an abomination), The Leviathan is a result of the Sullen, sinners who drowned eternally out of despair, being merged together by the same force that created the other Demons, and it will bring forth the Apocalypse.
• Dragons Are Demonic: It's a Demon that's based on Sea Serpents, which are often dragons themselves. The Leviathan is also born from the bodies of despair-ridden Sinners, and it is said to herald the Apocalypse.
• Early-Bird Cameo: When viewed through one of the ship's windows in 5-3, The Leviathan's tail can be seen as it swims across the Ocean Styx.
• Feed It a Bomb: Zigzagged. Normally, it opening its mouth doesn't make it extra vulnerable to explosives... unless it's launching its Breath Weapon. Because explosions will reflect Hell orbs and it spams those en masse when attacking, shooting explosives into its mouth when it spews out that attack can take giant chunks out of its health meter.
• Giant Space Flea from Nowhere: Downplayed; while it does have some buildup, it's missable, and the only direct teaser appearance before its boss level is in an optional side path in 5-3. Storywise, the Leviathan also has very little significance in comparison to other layer climax bosses (such as Minos, Gabriel, or V2), with its main impact on the story merely being that it was something Gabriel fought and that its lore entry mentions the Sullen and the implication that Hell itself created it and the other Demons.
• The Great Serpent: The Leviathan is a titanic, serpentine demon with apocalyptic associations to boot.
• Hoist by His Own Petard: The Leviathan's orb barrage attack can be reflected with explosions, making the Rocket Launcher, the Shotgun's projectile-boosted shells, the Sharpshooter Revolver, and especially the Malicious Railcannon excellent choices for this boss. Even the Terminal's "Tip of the Day" tells you about this.
• Kaiju: The Leviathan is the largest Demon in the game by far, rivaling the massive Corpse of King Minos in sheer length.
• Kraken and Leviathan: It falls under the Leviathan side of this trope.
• Leitmotif: "The Abyss and the Serpent", an orchestral piece that captures the awe and horror of the Leviathan's titanic size, along with the despair and agony of the countless sullen that makes up the demon's serpentine mass.
• Lightning Reveal: The Leviathan is well-hidden in the darkness of 5-4 until lightning reveals its Sinister Silhouette.
• More Dakka: Sprays a barrage of Hell orbs as its ranged attack.
• Our Demons Are Different: A titanic sea serpent with humanoid faces surrounding its body.
• Our Dragons Are Different: While a Demon, The Leviathan is currently the closest thing the game has to a dragon, thanks to being a titanic Sea Serpent that breathes Hell orbs.
• Roar Before Beating: The Leviathan lets out a loud roar before its boss fight.
• "The Scream" Parody: A horrific example rather than a comedic one. The heart resembles the painting's iconic, horrified character because it contains all the trapped souls of the Sullen. All they can do is scream in their collective agony.
• Sea Monster: It's a titanic, serpentine demon that calls the ocean Styx home.
• Sealed Evil in a Can: Its lore entry states that the Leviathan will herald the Apocalypse, but it was trapped in the Ocean Styx, thanks to being struck down by Gabriel with his holy spears. Not that it helped, since it's been growing as more Sinners gave into despair and sunk to the bottom of the Ocean Styx.
• Snakes Are Sinister: The Leviathan is a titanic, abhorrent, snake-like Demon that is said to herald the Apocalypse. Its body is formed from the Sullen, sinners who sunk to the Ocean Styx's abyss after struggling for air. As more sinners sink to the abyss after giving into despair, the Leviathan grows bigger and stronger the more sinners it absorbs into its body. In a way, the Leviathan feeds on despair.
• Stationary Boss: Downplayed. While it stays near the battle arena, the Leviathan changes positions depending on its attacks, unlike the Corpse of King Minos or the 1000-THR "Earthmover", where they stay in one spot for the whole time during their respective boss battles.
• Tail Slap: It can whip V1 with its long tail. Depending on the height and the attack's direction, the tail can be dodged by jumping over it, hooking onto the Whiplash orbs, or staying under it.
• Underwater Boss Battle: You encounter this thing in the dark depths of the ocean Styx. Subverted, as you're launched into the surface to fight it on a dock.

Minotaur

Minotaur

Rank: Supreme Demon

^{Phase 2}

A bull-shaped demon sculpted by ████ ██████ as a gift to Minos. The former Judge of Hell found it abominable, and cast it into Violence to get away. Now, as the sub-boss of Violence guarding the exit of 7-1, it fights and struggles to see the sky one last time.

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• Adaptational Badass: In The Divine Comedy, Dante and Virgil manage to get past the Minotaur by enraging it and tricking it into charging into a rock. In this game, V1 has to fight it twice to proceed.
• Adaptational Sympathy: In the poem, the Minotaur is treated as a mindless obstacle for Dante and Vergil to overcome. Here in this game, the Minotaur is revealed by its lore entry to be a Tragic Monster whose equally Tragic Dream is to see the sky one last time before it finally dies; a dream it failed to accomplish despite its great efforts.
• Adaptation Species Change: In the poem, the Minotaur is a standard half-human and half-bull creature. In the game, however, the Minotaur is a Demon resembling a bull-shaped mish-mash of meat and stone.
• Advancing Boss of Doom: The first phase of the Minotaur involves fighting on speeding trams while it pursues right behind. While there is no time penalty, falling down the tracks is very easy.
• Animalistic Abomination: A Hideous Mass-esque mishmash of flesh and stone in the vague shape of a bull.
• Boss Tease: You first get an idea of what the boss of 7-1 will be when the Minotaur breaks down a door and flattens a bunch of Mannequins, spraying blood everywhere before careening through the opposite door. It moves so fast, though, that you may not even be able to get a good look at it, preserving much of the mystery of what it is.
• Broken Angel: Or Demon, as the case may be. The Minotaur is so old, and has been running desperately and blindly through its Labyrinth for so damn long, that it's visibly falling apart by the time you find it. Its armor is filthy and battered, its flesh is practically rotting, and its very insides are hanging loose and practically scraping the ground.
• Brutish Bulls: Much like the mythological creature it's based on, the Minotaur is a fast, powerful, and unrelenting bull-like Demon that will stop at nothing to smash V1 to death if it means freedom.
• Brutish Character, Brutish Weapon: A Brutish Bull of a demon wielding an equally gnarly hammer made of flesh.
• Bullfight Boss: Appropriately for a bull-like Demon, the Minotaur can be tricked into charging head-first into a wall during its second phase, which deals heavy damage.
• Chase Fight: During its first phase it chases after you while you're riding a train.
• Close-Range Combatant: Unlike many other enemies and bosses, the Minotaur has no truly ranged attacks besides its Foe-Tossing Charge in its second phase and relies exclusively on trampling its foes up close and smashing them with its hammer.
• Dented Iron: After you defeat its first phase on the train tracks, it can be seen having lost several pieces of its armor in its second phase, revealing the bruised red flesh underneath.
• Dynamic Entry: Does this twice. The first time is when you're riding a train, with it suddenly appearing behind it and obliterating a cart with some Husks with its massive hammer. Then, once you reach the exit, it bursts through a wall, beginning a climactic round two.
• Foreshadowing: The Minotaur can be faintly heard in the room with the α button.
• Humongous-Headed Hammer: It fights with a gigantic cudgel nearly a third the size of its total body.
• It Can Think: Demons are generally noted to be not much more intelligent than Husks, and all of them except the Idol display nothing but sheer hostility. However, the Minotaur has an actual reason for its rampage; it just wants to escape from the Garden of Forking Paths and see the sky outside.
• The Juggernaut: Like most other Demons, the Minotaur is covered in stone statues which serve as No-Sell armor, meaning the only way to counter its oppressive assault is to Attack Its Weak Point or get out of the way.
• Jumpscare: V1 depletes the Minotaur's health bar, and the speeding platforms come to the end of the line. A quick stroll through another hallway reveals the exit tunnel at the end of a short room...and then the Minotaur comes crashing through the room's wall, back with a vengeance and with even deadlier attacks.
• Lightning Bruiser: In contrast to most demons, which are Mighty Glaciers, the Minotaur is fast enough to keep up with a speeding train AND has the agility to swing its hammer in frenzied combos, all of this on top of having near-invulnerable armor and plenty of health.
• Living Statue: As with other Demon type enemies. This one, however, is so old its fleshy parts are rotting.
• Marathon Boss: In a marked departure from most other ULTRAKILL bosses, the Minotaur is not intended to be fought at mach 10 and killed in 30 seconds, instead encouraging a slow and steady erosion of its health bar through consistent damage while evading its attacks. It's downplayed as it doesn't have very much more health than other bosses, but that health will likely go down much slower than, say, Gabriel in his first fight.
• No Fair Cheating: Trying to land delicately on its back so that you can cheese it without it being able to hit you in its first phase will have it start swiping you off with one of its smaller limbs.
• Our Minotaurs Are Different: This one isn't a half-man, half-bull hybrid, but a grotesque demonic amalgamation of flesh and stone in the vague shape of a bull given as a "gift" to King Minos. Its terminal entry states that it's a reproduction based on the original Bull of Minos (which is why Minos hated it, as it reminded him of that time that he let his wife get impregnated by a bull and then had to feed their child seven children every month for several decades), indicating that a more traditional Minotaur existed at one point in the ULTRAKILL universe as well.
• Painting the Medium: The Minotaur's name and its lore entry are struck through, with the data being in red text.
• Poisonous Person: It can rip out its own gangrenous organs and smash them against the ground in order to turn the floor into hazardous poison-covered terrain. In its second phase, it gains the ability to crush one of these organs in its hand and create a sphere of poison around itself.
• Platform Battle: Its first phase has V1 fight it on three rapidly moving platforms which it can destroy and make inhospitable using its various attacks as well as knock V1 onto the tracks if they aren't careful^note V1 cannot stand on the tracks like in 2-4 and instead takes persistent damage, adding a level of complexity and required precision to its otherwise simplistic move set.
• The Right Hand of Doom: Its right arm is much larger than the two stubby arms attached to its left side, and it also uses its right arm to wield its Humongous-Headed Hammer.
• Sequential Boss: It has two phases with a small break between them. The first phase is the Minotaur chasing you on the railway, even capable of destroying train carts. When you approach the exit, it suddenly bursts out of the wall, eager for a rematch.
• Shout-Out: In the Minotaur's terminal entry, its name is crossed out and in red, referencing the Minotaur from House of Leaves and how information on it was similarly in red and stricken out.
• Songs in the Key of Panic: Its boss theme, "Bull of Hell", is a thunderous droning piece which screams "there is something coming up right behind you and you'd better run right now or you're going to be flatter than a pancake", complimenting how the Minotaur is The Juggernaut and an Advancing Boss of Doom.
• Tragic Dream: The Minotaur's only desire is to see the sky one more time, but its dream is cut short by V1 when both of them are forced into a duel to the death by Hell itself.
• Tragic Monster: It was created by ████ ██████ as a gift to King Minos, but the king found it so appalling that he cast it into the Garden of Forking Paths. It has been trapped there for such a long time that its body started to wear down and rot and it blindly searches for an exit, trampling everything in its way. You killing the beast would have been considered a Mercy Kill if not for the fact that in doing so you shattered its wish to see the sky for the last time.
• Unperson: What happened to both the Minotaur and the one who created it. The Minotaur's name and text entry are struck through, and the creator's name is completely blocked out.

1000 - THR Earthmover

1000 - THR "Earthmover"

Rank: Supreme Machine

^{Click here to see its brain.}

Colossal robots that loom over an eternal battlefield, the Earthmovers were the pinnacle of the arms race. Often called the horsemen of the apocalypse, it took only one to level an entire city and leave nothing but fire in its wake. One of them serves as the boss of Violence.

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• Achilles' Heel:
  • For all of its city-destroying superweapon power, and internal defense systems, it turns out that the biggest vulnerability it has is the improbability of human-sized combatants getting close enough to commit a Colossus Climb and destroying its brain internally. Considering the sheer number of forces on its structure and the scope of said climb, this would normally not be an issue — were it not for V1 being perfectly equipped for the task at hand and seemingly even designed for this specific purpose back during the Final War.
  • Its immense size comes with another weakness as well: It requires solar power to function alongside the standard blood fueling of machines. When the Long Night came, they were rendered irrelevant as they could no longer function and the war mostly ended there. In Hell, they appear to have shed this weakness and are now very active in Violence.
  • In gameplay terms, its brain is incredibly vulnerable to the Sawblade Launcher. The circular pattern the sawblades follow when attracted to a magnet, combined with the brain's large size and inability to move, means it'll be constantly damaged by the sawblades as they pass. One full barrage of sawblades can easily take off a third of its health on their own, and that's not even getting into the superheated sawblades from the green Launcher...
  • Both the brain and the defense system are stationary, making them very vulnerable to Freezefeame Rocket Launcher. Due to the lack of mobility, frozen rockets can easily be charged mid-air and still hit the target.
• Adaptation Species Change: In the poem, the Centaurs are half-human and half-horse creatures. Here in this game, their equivalents are the Earthmovers, horse-shaped Humongous Mechas that take part in the Forever War of Violence.
• Adaptational Badass: Also overlaps with Adaptation Species Change. The Centaurs are already formidable guards of the Violence Layer in the poem, but their game's parallels are WMDs that are so dangerous that not only is one enough to reduce an entire city to rubble and cinders, they polluted the entire Earth by blotting out the sun from their battles.
• Always a Bigger Fish: The moment you enter 7-4, an Earthmover targets V1 and prepares to strike. The only reason V1 isn't instantly obliterated is because an even bigger threat cuts in: another Earthmover.
• Always Close: After bouncing off the final vent pad to escape, the explosion timer cuts down to 3 seconds.
• Ascended Extra: The Centaurs in the poem are mostly background characters that serve to guard the Violence layer, and the most they contribute to the story is when one of them helps guide Dante and Vergil cross the blood river Phlegethon. Here in this game, the Earthmovers serve as their analog and not only does one of them serve as the game's Climax Boss, they also have lore significance, as their lore entry gives us more insight into the Final War and its aftermath, along with the implication that V1 was designed to counter them during the Lensman Arms Race.
• Battleship Raid: Also overlaps with Colossus Climb and Level in Boss Clothing. The boss fight consists of you mowing down gauntlets of mooks as you scale the Humongous Mecha's body before fighting its security system to access the way to its brain, though there's a challenge to skip the defense system entirely.
• Beast of the Apocalypse: So much so that their lore entry describes them as Horsemen of the Apocalypse. Humanity came to see them this way, as the Earth was slowly ground down to nothing by their work and they were forced to live upon them, as the only safe place left upon the world while they destroyed everything else. Hell itself definitely saw them that way, finding them the perfect culmination to mankind's drive to wipe themselves out, believing they should've been the ones to finish humanity off, then die off themselves, leaving an empty world.
• Behemoth Battle: Only in the background, but the Earthmover V1 climbs in 7-4 is locked in battle with another far off on the horizon.
• Boss-Only Level: Since it's a Battleship Raid, 7-4 is quite literally just the Earthmover standing in a gigantic barren field. Of course, climbing its body is still technically an actual level.
• Brain in a Jar: The Earthmover's colossal brain sits inside of a giant shielded container that defends itself with laser grids and giant homing Hell orbs.
• Climax Boss: The Earthmover is a Humongous Mecha that serves as the boss of Violence, the 7th out of the 9 Layers of Hell. The Earthmover is fought as an epic Battleship Raid boss where you scale on its titanic body while mowing down gauntlets of mooks in your way until you kill it from the inside by destroying its brain, followed by a thrilling escape sequence where you try to escape with your life while dealing with one more gauntlet before the Earthmover explodes. The Earthmover also has lore significance, as shown by its lore entry implying that V1 was designed to counter it and its ilk by infiltrating them from the inside during the Lensman Arms Race, meaning they've fulfilled their purpose by killing it. A hidden book can also be found in an otherwise empty alleyway in the city sitting on its back whose texts are implied to be the thoughts of Hell itself where it praises the Earthmovers for causing great carnage and destruction in their wake, hoping that they killed off humanity.
• Colossus Climb: One Earthmover is big enough to make up an entire level.
• Cores-and-Turrets Boss: The 1000-THR Security System consists of 6 turrets and a core that becomes vulnerable once the turrets are gone.
• Curb Stomp Cushion: Though the Earthmover falls victim to an attack on its vulnerable innards, it starts the fight by successfully drawing a bead on V1 with its main cannon before another Earthmover creates a distraction.
• Defeat Equals Explosion: The main body of the Earthmover is obliterated by the meltdown, with only its legs tumbling down.
• Deflector Shields: The Earthmover can repel large projectiles by having an energy shield around it that only becomes partly visible when a dangerous projectile (such as another Earthmover's lightning blast) hits it. Earthmovers are notable in the story for being the only machines large enough to be equipped with shield generators, leading to their utter dominance in the field of war.
• Early-Bird Cameo: The Earthmovers make an early appearance in 7-2 where their six glowing eyes are observing the battlefield around them, followed by occasional flashes of light that reveal their ominous outlines. One can also be seen in the background of 7-3.
• Easter Egg: Noclipping inside the Earthmover's central computer reveals a tiny plushie of Ultrakill's lead modeller, Victoria, behind a control panel. Additionally, the Earthmover in the distance of 7-4 has a plushie of concept artist BigRockBMP riding on its back. Also, noclipping inside a door in the building with the Malicious Face and the Mannequins reveals a potted sunflower with a Japanese warning sign reading "Generator Siphon Plant Plant".
• Expy: The brain of the Earthmover is very similar to the Mother Brain, the Big Bad of Metroid. 1000 in Roman numbers is M, so Earthmover’s designation can be read as M-THR, which is phonetically similar to "mother".
• Glowing Eyes of Doom: Their six eyes glow an eerie white in the pitch-black darkness of 7-2's skies, which are only disrupted by flashes of light that reveal their ominous outlines.
• Godzilla Threshold: Considered one of the most destructive weapons ever produced, if not the most destructive in terms of overall conflict capability. It's enough so that Hell itself practically idolizes their destructive potential, and it's implied that V1's own creation was crossing the threshold in response to the Earthmovers specifically to destroy them, though the Long Night rendered all of that moot. For this reason, Hell seems to have personally acquired these massive platforms of total destruction for eternal war in the Violence layer on its own terms.
• Gratuitous Japanese: The Earthmover has several signs in their frames written in Japanese, suggesting that their origins are from Japan.
• Hellish Horse: These Killer Robots have vaguely equine forms, and they're spending their existence ominously observing and sometimes partaking in the Forever War taking place within the Violence Layer, which is a Hellish warzone. Their lore entry also mentioned how the Earthmovers are so apocalyptic they were even called the Horsemen of the Apocalypse due to their battles causing the Long Night, an ecological catastrophe that blotted out the sun for a long time.
• Horsemen of the Apocalypse: The Earthmovers' lore entry explicitly describes them as such, since they're colossal, horse-shaped, Killer Robots that nearly caused The End of the World as We Know It. Their actions and consequences also correspond with each of the four Horsemen:
  • Conquest/Pestilence: The Earthmovers were built to be essentially the pinnacle of the ongoing Final War and its undoubted victor, especially given the V units didn't enter production before The Long Night ended the conflict. Their primary weapon is also a blinding white projectile, evoking the white rider carrying a bow and arrow. Under the alternative Pestilence read, The Earthmovers caused the aforementioned Long Night, an ecological nightmare that blotted out the sun from the Earth and wiped out all flora and fauna life on the surface, forcing civilians to survive by building cities on the Earthmovers' backs.
  • War: The Earthmovers are pinnacles of the Lensman Arms Race to the point where war is entirely dependent on them.
  • Famine: The Long Night caused the Earthmovers to shut down one by one since their massive size requires the need for both blood and sunlight, and the lack of the latter effectively starved the Earthmovers to death.
  • Death: Their battles represent not just War, but also Death by reducing cities into rubbles and cinders. The Long Night that resulted from their actions, which enabled the survival of humanity, also seemingly enraged Hell Itself into personally ending humanity, following how it was said Hell followed behind the arrival of Death.
• Humongous Mecha: The Earthmovers are so huge that they put both the Corpse of King Minos and the Leviathan to shame, and they even have small cities upon their backs.
• Irony: As the terminal entry goes, they are singlehandedly the most destructive machine ever made in terms of raw power and scale, and wiped out the Earth so hard that humanity had to live on their backs because all flora and fauna simply ceased to exist. Hell was entirely banking on this causing The End of the World as We Know It. And then all the soot and decay the Earthmovers caused in their Forever War blotted out the sun to start the Long Night, shutting off the gigantic machines because they were solar-powered, forcing what was left of humanity into a ceasefire of the New Peace, and ruining Hell's plans as it was forced to corrupt humanity more directly to achieve its goals; the very apocalyptic force that Hell outright idolizes as the pinnacle of the self-destructive might of humanity ultimately saved the world by accident and long-term consequences.
• Javelin Thrower: Somewhat bizarrely, its main armament doesn't function like a simple point-and-shoot cannon or laser; rather, the Earthmover swings the thing as if it were a spear flung into the distance, except only releasing a massive blast of lightning rather than throwing it. Even when it's about to reduce V1 to component atoms it looks like it's about to skewer them like a fish rather than just shoot them.
• Laser Sight: The rocket turrets of its defense system aim with bright red lasers.
• Lensman Arms Race: The Earthmovers were the ultimate culmination of every war machine before them in the Final War, beings with such destructive power that they wound up making the Final War live up to its name— humanity's creation of them in an effort to stay technologically equal to each other during the war nearly led to humanity's own destruction as the Earthmovers came very close to wiping them out before the Great Peace. As a book found on the Earthmover (possibly written by Hell itself) reads:
  THIS IS THE ONLY WAY IT COULD HAVE ENDED.
  WAR NO LONGER NEEDED ITS ULTIMATE PRACTICIONER. IT HAD BECOME A SELF-SUSTAINING SYSTEM. MAN WAS CRUSHED UNDER THE WHEELS OF A MACHINE CREATED TO CREATE THE MACHINE TO CRUSH THE MACHINE. SAMSARA OF CUT SINEW AND CRUSHED BONE. DEATH WITHOUT LIFE. NULL OUROBOROS. ALL THAT REMAINED IS WAR WITHOUT REASON.
  A MAGNUM OPUS. A COLD TOWER OF STEEL. A MACHINE BUILT TO END WAR IS ALWAYS A MACHINE BUILT TO CONTINUE WAR. YOU WERE BEAUTIFUL, OUTSTRETCHED LIKE ANTENNAS TO HEAVEN. YOU WERE BEYOND YOUR CREATORS. YOU REACHED FOR GOD, AND YOU FELL. NONE WERE LEFT TO SPEAK YOUR EULOGY. NO FINAL WORDS, NO CONCLUDING STATEMENT. NO POINT. PERFECT CLOSURE.
     T H I S I S T H E O N L Y W A Y I T S H O U L D H A V E E N D E D .   
• Lightning Gun: Its main armament is a WMD-level lightning cannon hundreds of feet in length that can wipe cities miles away right off the map.
• Load-Bearing Boss: After its brain is critically damaged, a timer counting down until the whole machine is obliterated starts. It's additionally justified in another way because the Earthmover is under assault by one of its kin and it won't take too long before its shields are drained and the killing shot lands.
• Meaningful Name: Both Played for Laughs and Played for Drama.
  • The 1000-THR name of the Earthmover has multiple meanings. The number 1000 in Japanese is "Sen", which when paired with "THR" creates "Sen-THR", which is phonetically similar to "Centaur", which are the creatures of the original poem the Earthmover is based on. This has been confirmed to be intentional by Hakita, the head developer of the game. THR may also refer to the Nordic God Thor and Ragnarok to a lesser extent, which may refer to the lightning weapon it comes equipped with, along with causing an apocalyptic battle that brought forth a new era of prosperity from its ashes.
  • The "Earthmover" codename, on the other hand, is quite fitting for these centaurs, as they can move the earth both figuratively and literally.
• Meat-Sack Robot: While all Machines are this trope to begin with, the Earthmovers are the first robots to give us a good understanding of their internal structure, as shown by the interior being a fleshy stomach-like room with boiling blood in the bottom, along with an organic brain beneath an artificial exterior. Also, there appears to be tree roots from 7-3 growing on its legs and feet.
• Mechanical Abomination: The towering robots give off a foreboding presence just by looming over the battlefield, and the more you find out about them, the worse they get. Earthmovers were already close to Horsemen of the Apocalypse made by man's own hand before they came to Hell: Powered by blood, immune to anything short of each other and utterly devastating the world as a whole with their weapons, they monopolized warfare to the point of making it self-sustaining and nearly perpetual, leaving their creators with utterly no say in their own fates and the world around them. It's no coincidence at all that they're found in the ring of Violence that punishes sins against Art, Nature, and God himself. Also overlaps with Animalistic Abomination due to their horse-like shape.
• Mechanical Horse: The Earthmovers are colossal, horse-shaped robots of death.
• Our Centaurs Are Different: These aren't the half-human and half-horse creatures we know of. Instead, they're colossal Killer Robots that vaguely look like horses with laser lances as their single arm.
• Post-Defeat Explosion Chain: The ravaged brain of the Earthmover continuously lets out explosions for the remainder of its existence.
• Reactor Boss: While the machine's health bar is present throughout the time you're scaling it, the true boss fight is against its brain.
• Shielded Core Boss: The Earthmover's brain can summon a pair of Idols during its boss fight to protect itself.
• Sinister Silhouettes: Just like Wrath's Leviathan, these towering robots are shrouded in the darkness of 7-2 until a great explosion illuminates the background to reveal their ominous outlines.
• Skippable Boss: Not the Earthmover itself, but the fight against the security system it has to prevent intruders from accessing its brain can be bypassed.
• Songs in the Key of Panic: The further you progress throughout the Earthmover's body, the more disharmonic, urgent and cacophonic its Battle Theme Music "War Without Reason" begins to become as it begins incorporating all the warning bells and alarm sirens V1 is triggering inside of it, gradually climbing to a crescendo right before the Earthmover self-destructs.
• Stationary Boss: The one you fight in 7-4 doesn't move an inch. Justified because its feet are overgrown with the blood trees' roots from 7-3.
• There Is No Kill Like Overkill: Upon sighting V1 at the very start of the level, it was entirely too ready to blast the human-sized (or smaller) robot with a gigantic beam cannon made to obliterate its own mountain-sized fellows, and is only interrupted by a shot from another Earthmover.
• Tiny-Headed Behemoth: Upon closer inspection of the Earthmover's design, what appears to be the head and neck are actually the torso, and the real head is the round black structure where its six eyes are at.
• Took a Level in Badass: Implied from the terminal entry on them, as they're described as requiring solar power and, upon the sky becoming too clouded by smoke and soot, they quickly died out one by one, whereas Violence has no visible sun and, if anything, appears to take place in an eternal night with tons of Earthmovers striding about. The one you fight also has Idols protecting its brain, which would be anachronistic if they weren't implemented after they first ended up in Hell, possibly by Hell itself.
• Wave-Motion Gun: Its main armament is a cannon shooting gigantic lightning arcs, which it swings around like a javelin to fire.
• Weapon of Mass Destruction: These nearly invincible engines of war were single-handedly responsible for blocking out the sun with their sheer destructive power.

Bonus Bosses (Unmarked Spoilers)

Level 1-2 Bonus Boss

Cancerous Rodent & Very Cancerous Rodent

Rank: Unclassified^note Unlike other "Unclassified" enemies, Cancerous Rodent doesn't even get its own database entry.

^{Click here to see the Very Cancerous Rodent}

"Oh, hey Civvie!"

A curious green mouse "fought" in 1-2. Actually a herald for its larger and more dangerous sibling, fought in the same room.

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• Contractual Boss Immunity: Funnily enough, Cancerous Rodent (which only has 0.5 health) is immune to the Whiplash, all explosions, and coin shots.
• Death by Cameo: Came all the way from Civvie's Dungeon just to get smashed by V1. Poor mouse.
• Easy Level Trick: The Very Cancerous Rodent can be easily beaten by stomping on it repeatedly. Not only does it take extra damage from stomps, but its completely helpless; its projectiles can't reach V1 when they're standing directly on top of it, and it has no other attacks. All subsequent guest bosses have a strategy to easily beat them like this.
• Giant Space Flea from Nowhere: Neither of them have database entries, and thus the reason for their presence is unexplained.
• Shout-Out: As mentioned above, the Cancerous Rodents are references to Cancer Mouse, a recurring character from Civvie's Dungeon.
• Stationary Boss: Very Cancerous Rodent doesn't move an inch, but it retaliates with homing Hell orbs that explode on contact.
• Zero-Effort Boss: The first Cancerous Rodent. It can barely move, can't hurt you, and dies to a single hit from ANYTHING.

Level 1-3 Bonus Boss

Agony and Tundra

Rank: Greater Machines

Tundra on the left, Agony on the right.

A duo of Swordsmachines, one red and one blue. Fought in 1-3.

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• Dual Boss: Two Swordsmachines with differing combat styles.
• Fanboy: The terminal entry for the first Swordsmachine notes that its notoriety among robots led to a few trying to imitate its appearance, hoping to emulate its success. This tidbit alludes to Agony and Tundra before V1 meets them in the Halls of Sacred Remains.
• Lightning/Fire Juxtaposition: Not Agony and Tundra themselves, but rather their weaknesses: Tundra (which is blue) takes bonus damage from explosions (which are red), while Agony (which is red) takes bonus damage from electric attacks (which are blue).
• Red Oni, Blue Oni: Swordsmachine "Agony" is the Red and uses the aggressive moveset of an enraged Swordsmachine, while Swordsmachine "Tundra" is the Blue and utilizes the ranged sword throws of phase 2 Swordsmachine.
• Short Range Guy, Long Range Guy: One of them fights up close, the other uses projectiles.
• Shout-Out: They're a reference to Agni and Rudra from Devil May Cry 3: Dante's Awakening.

Level 4-3 Bonus Boss

Mysterious Druid Knight (& Owl)

Rank: Unclassified

Druid Knight: "Finally, our waiting puzzle is over."
Owl: "What?"

Voiced by: MandaloreGaming (Druid Knight), Shammy (Owl)

A strange knight and his owl companion entombed and encountered in a closed-off secret room in 4-3.

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• Bullet Hell: Their "fuller auto" attack is a barrage of homing blue Hell orbs.
• Calling Your Attacks: Announces their attacks before using them; "Full Auto" and "Fuller Auto".
• Cool Helmet: The Druid Knight's only accessory is his low-poly knight helmet with a yellow plume/ponytail.
• Damage-Sponge Boss: Zigzagged heavily, as while the duo has four health bars, each bar only has 20 HP, resulting in a total of 80 HP, which is significantly less than the Sisyphean Insurrectionist's 110 HP (who V1 fights in the previous level) and is also the same amount of HP V2 has. Not only that, you can kill them instantly if you redirect their blue Hell orb barrage back at them with a well-timed explosion.
• Death Cry Echo: Druid Knight lets out one of these when beaten, though Owl opts to snark at their demise instead.
  Owl: "Oh great, now we lost the fight, fantastic."
• Dem Bones: The Mysterious Druid Knight is nothing much besides a skeleton with a knight's helmet (and cartoon eyes visible from the visor).
• Easy Level Trick: The Druid Knight's "fuller auto" attack can blow up in his face spectacularly when parried at the right time. It is a massive wave of projectiles, so if V1 successfully parries one of the first to spawn, the projectile will redirect nearly all following it back into the Knight, substantially damaging him if it doesn't instantly kill him.
• Elite Mook: The Mysterious Druid Knight behaves mostly like a Drone, barring the fact that he has two attacks instead of the Drone's one and his death explosion is that of a Mindflayer. He'll also coat himself in sand when down to a quarter of his health, something that cannot normally happen due to Stalkers ignoring flying enemies. The Spawner Hand, thanks to a bug, also names him Drone, suggesting at least part of his code was taken directly from that of the Drone.
• Giant Space Flea from Nowhere: Like the Cancerous Rodents, the Mysterious Druid Knight and Owl have no lore entry, and the reason for their appearance in the story is unexplained.
• More Dakka: Both of the Druid Knight's attacks fire a ridiculous amount of hell bullets; the only things that compare are the Flesh Prison and the Leviathan. With explosive knockback, this can easily be turned against him.
• Precision F-Strike: One of their lines upon respawning:
  Owl: "I'm going to FUCKING poison you!"
  Druid Knight: "What?"
• Shout-Out: The Druid Knight and the Owl are references to Mandalore and Shammy respectively. The designation of the Knight as a "Mysterious Druid," his mention of a "waiting puzzle" upon awakening, his distinctive pose, and his Owl companion's urging to use salt are all nods to one of the most popular videos on Mandalore's channel: a review of The Mystery of the Druids.
• Straight Man and Wise Guy: The Druid Knight (Mandalore) is a Large Ham who takes his role as a bonus boss very seriously, while the Owl (Shammy) provides snarky commentary without attempting to be in character at all.
• Taking You with Me: Identical to a dying Drone, their final attack upon reaching zero health is to fly in a straight line and explode on contact, albeit with an explosion as big as a Mindflayer's.
• Turns Red: The duo gets more aggressive in the later phases, and they coat themselves with sand in the last.
• Waiting Puzzle: In-universe, they were supposedly doing a waiting puzzle, as heard in Druid Knight's voice line.

Level 6-1 Bonus Boss

Angry & Rude

Rank: Supreme Husks

A duo of Insurrectionists fought in 6-1 by placing a red skull at the right pedestal.

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• Artifact Mook: Unlike Agony & Tundra, who can be considered fanboys of the original Swordsmachine and therefore someone who could be found deeper into Hell, there seems to be no real reason to explain two differently colored Insurrectionists just hanging out in Heresy unless one believes they're continuing their king's insurrection. They're also further separated from their reference, Agni & Rudra: Agony & Tundra use swords while Angry & Rude are Insurrectionists, hurling around Malicious Faces.
• Dual Boss: Two Insurrectionists that are fought together, though they only have the health of the Degraded Boss version to compensate.
• Red Oni, Blue Oni: Subverted. Unlike Agony & Tundra, their colors are only a cosmetic difference.
• Shout-Out: Like Agony & Tundra before them, they're one to Agni & Rudra from Devil May Cry 3: Dante's Awakening.

Level 7-1 Bonus Boss

Big Johninator

Rank: Unknown (likely Machine)

Voiced by: Dave Oshry

Kill me! Kill me, c'mon!

Yuahahagh! Big John, yah, that's me!

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• The Ahnold: As per usual, Big John is a blatant reference to Arnold Schwarzenegger; this variation of him specifically is based on Schwarzenegger's appearances in the Terminator movies.
• Bring It: Played for Laughs; half of his voicelines are daring the player to kill him said in a really goofy accent.
• Composite Character: Combines the armaments of the Malicious Face and the Guttertank with the movement speed and dodging reflexes of V2.
• Creator Cameo: Big Johninator is (once again) voiced by and modeled after New Blood Interactive's CEO, Dave Oshry.
• Easy Level Trick: Like Guttertanks, Johninator's rockets can be frozen by the Freezeframe launcher. Unlike Guttertanks, he is not immune to his own splash damage or knockback, and he can easily get caught in his explosions even without the Freezeframe. The movement and weight he inherited from V2 work against him here; he's liable to jump or be launched high into the air... often subsequently into his own frozen rockets, which will deal heavy damage to him.
• Giant Space Flea from Nowhere: Downplayed as Big John's appearance in ULTRAKILL was inevitable for a New Blood game, but in the story and game itself he's just as out of nowhere as the Cancerous Rodents and the Mysterious Druid Knight (& Owl).
• Macross Missile Massacre: Fires a massive salvo of rockets in addition to his minigun.
• Recurring Character: Really, it was only a matter of time before Big John properly appeared in ULTRAKILL; he's invaded so many other New Blood properties before.
• Terminator Impersonator: Big John is already a goofy Schwarzenegger reference, but here, he's a Killer Robot with glowing red eyes and is given the name variant "Big Johninator."
• Underground Monkey: His AI is based on V2, but he uses different weapons.

Level P-1 First Bonus Boss

Flesh Prison

Rank: Unclassified

A giant octahedron suspended on two stalks, found behind the Perfect Door in 3-1. Unleashes Bullet Hell on all who would attempt to break free its prisoner.

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• Eldritch Abomination: The Flesh Prison is a sinister octahedron that's both angelic and demonic in nature, is described as an "organic machine", and was designed to seal souls to prevent them from becoming Prime Souls.
• Eyes Do Not Belong There: Has eyes on some of its facets, but nothing resembling a "face".
• Faceless Eye: Summons floating eyeballs.
• Flunky Boss: Periodically summons a score of floating eye minions that add to the Bullet Hell and can later be sacrificed to heal. On higher difficulties, it summons tiny Malicious Faces instead.
• Golem: Noted to lack even the simplest thought, merely executing preset reactions to stimuli. Its Terminal entry explicitly calls it an "organic machine".
• Holy Hand Grenade: Flesh Prison summons light beams similar to the Virtues', indicated by a white glow, and supporting the fact that it was created by angels.
• Homing Projectile: Whenever the Prison flashes blue, it starts spinning in place faster while holding its mouth open, letting loose several homing blue hell energy orbs as it does. Notably, the boss cannot perform any other action until the attack is complete—this includes its interactions with its eyeball minions. Thus, it's possible to prolong the Flesh Prison's summoning and healing periods by letting it use this attack, allowing V1 to soak in more damage on the Prison or kill any remaining minions before the Prison heals itself with them.
• Leitmotif: "CHAOS".
• More Dakka: The sheer chaos of fighting the Flesh Prison stems from its many projectile attacks. By itself, it can fire a massive volley of blue homing hell energy balls, fire columns of light that it attempts to lead with, and produce homing black holes that reduce V1's maximum HP to One if they make contact. The Prison also ups the ante with its own personal summonable minions, which appear in great numbers and fire hitscan beams. In Violent difficulty, the Flesh Prison also summons tiny Malicious Faces that fire explosive hitscan beams.
• Shoot the Medic First: The eyeballs heal the Flesh Prison when enough damage is dealt. Considering how much damage this boss can soak in, it's a priority to get rid of the eyeballs as soon as possible. If you see a green glow and hear a droning noise, that's when the eyeballs are about to heal Flesh Prison.
• Slasher Smile: Its mouth is locked in a disturbing, toothy grin. It serves to make it even more unsettling.
• Stationary Boss: Remains rooted in place through the whole fight.
• Superboss: The Flesh Prison is a tough Optional Boss that can only be unlocked by P-ranking all of Prelude and Act 1, thanks to its massive HP pool of 100, 50% resistance to the Electric Railcannon, and its medic mooks. The worst part? Flesh Prison isn't the real star of the show; that honor belongs to its prisoner: Minos Prime.
• Unrealistic Black Hole: Flesh Prison uses the same black holes summoned by Minos' Corpse—the same ones that reduce V1's maximum health to 1 for a time—indicated by a purple glow.
• Yin-Yang Bomb: Combines angelic magic with Hell energy, resulting in a chaotic barrage of attacks.

Level P-1 Second Bonus Boss

Minos Prime

Rank: Prime Soul

^{Lust Renaissance-era Minos}

"Creature of steel... my gratitude upon thee for my freedom. But the crimes thy kind have committed against humanity are not... forgotten! And thy punishment... is DEATH."

Voiced by: Stephan Weyte

The pure soul of King Minos, too powerful to be destroyed by the angels and thus sealed in a Flesh Prison. Though grateful for being freed, he remembers the machines' sins and seeks to punish V1 for their involvement in humanity's extinction.

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• Adaptational Heroism: In The Divine Comedy, King Minos is the ruthless judge of Hell who sentences souls to one of its layers depending on their sins. Meanwhile, in this game, King Minos is a loving king who turned the Lust Layer into a thriving paradise because he felt eternal damnation is an unfair punishment for sinners who simply loved another. This also applies to the Lust Layer itself, where not only was it reformed into a paradise (even for just a while), its poem counterpart is mentioned to also contain rapists, who seemingly don't exist in this version.
• Adaptational Species Change: In the original poem, King Minos is depicted as a titanic monster that is half-man and half-snake. Here in this game, he's depicted as a completely humanoid Husk whose only references to his poem counterpart's serpentine traits are his snake motifs.
• And I Must Scream: While he was sealed in the Flesh Prison, Minos helplessly watched his own parasite-controlled corpse destroying all of the good he and his people worked hard for.
• Animal Battle Aura: He's surrounded by ethereal snakes and uses them in his fighting skills.
• Animal Motif: As a reference to his original Dante's Inferno counterpart (who's a serpentine monster), King Minos has a snake motif, which can be seen through his corpse (the parasitic worms controlling his corpse are described as serpentine), and through his Prime Soul (each of his arms are coiled by a snake, and he uses them to enhance his attacks. He also summons a large ethereal snake as a deadly homing projectile).
• Badass Boast: His vow of revenge after being freed.
  Minos Prime: O, Gabriel, now dawns thy reckoning, and thy gore shall glisten before the Temples of Man!
• Barbie Doll Anatomy: Downplayed. He has a visible bulge, but no dick.
• Battle Aura: Minos Prime forms an aura made of blue fire in his second phase.
• Boss Banter: Minos Prime yells at you a lot, signaling each of his attacks with their own unique taunts. Reloading from a checkpoint will cause Minos to insult V1, calling them USELESS.
• Bare-Fisted Monk: Utilizes powerful, refined melee attacks as his combat style.
• The Blank: He has a black featureless void where his face should be.
• Calling Your Attacks: He yells specific lines for his attacks. Use them as warnings.
  JUDGMENT: Teleport attack, followed by an explosive drop kick. This attack can be parried.
  DIE/CRUSH: Teleports above V1, then hurtles himself in their direction, leaving a shockwave upon impact. The latter is the exact same, except Minos Prime strikes directly downward toward the ground; it is only used at close range.
  PREPARE THYSELF: 3-hit combo. He kicks twice, then he fires a homing serpent that can be parried.
  THY END IS NOW: 4-punch combo. The final punch can be parried unless V1 is in mid-air, which will be replaced with an Uppercut.
• Deader than Dead: Killing Minos's soul seals his fate as this.
• Face Death with Despair: His last words are definitely despairing ones. Not because he himself is afraid to die, but because in reaching his final death he feels he has utterly failed to bring salvation to, or even just avenge, his beloved subjects and humankind as a whole.
• The Faceless: Due to the wounds he sustained between Gabriel's assault and the parasites entering his body, he only has a concave hole where his face had been. His facelessness also symbolizes his altruism, as he reformed the Lust Layer not out of any desire for fame or glory, but for the sake of prosperity and compassion for Lust's sinners.
• Flash Step: How he usually gets from point to point if he's not power-walking menacingly. There's so much force behind them that he leaves a trail of rubble whenever he does it.
• Good Is Not Soft: He may be The Good King, but he can also be incredibly wrathful. He plans to pulverize Gabriel for subjecting him and his people to misery for aeons, and while he does thank V1 for freeing him, he admits that he can't abide by V1 and their race's slaughter of humanity, and he will kill them for that.
• The Good King: Back when he was alive, King Minos is considered a fair ruler for turning the Lust Layer into a Utopia because he felt that eternal damnation is an unfair punishment for the sin of loving another. He's also a Reasonable Authority Figure because even before getting killed by Gabriel, he tried to reason with the angel rather than attack him, but sadly, Gabriel refused to listen. Even after his death, his legacy as a benevolent king is still fondly remembered by his people.
• Heavenly Blue: Minos Prime is clad in divine white and blue, and unlike Gabriel, Minos is genuinely heroic.
• Hero Antagonist: King Minos battles V1 to protect his people and punish the robot for their involvement in humanity's extinction.
• History Repeats: King Minos sending the Minotaur to the Garden of Forking Paths is not only a repetition of what he did to the original Minotaur in Crete, but also very similar to the way the Father cast Lucifer into the pits of Hell just for questioning him.
• Humanoid Abomination: His soul is a white and blue humanoid being with unfathomable power, red glowing veins, and a hole where his face should be.
• Kick the Dog: Though otherwise completely benevolent, his decision to cast the Minotaur down into Violence just because he found it hideous and a caricature of his mistakes was a serious dick move.
• Large Ham: While he has fewer lines than Gabriel (not to mention, they're shorter), not only does Minos Prime talk more frequently, but he shouts every word in his battle (except for a small "weak" when he Turns Red). You can exploit this trope to telegraph his attacks.
• Leitmotif: Has several. The leadup to the arena he resides in makes use of Maurice Depret's "Sourire d'Avril", which is also used in the buildup to both the first level in the layer he ruled over as well as the fight with his corpse. His battle theme, "ORDER", also incorporates "Requiem", the theme of 2-2, a stage containing several books that explain his backstory.
• Light Is Good: Minos Prime shines with a bright light and is every bit of a benevolent person as he was before he was sealed in the Flesh Prison, and fights V1 on behalf of all of humanity due to the robots being responsible for killing them all.
• Lightning Bruiser: In contrast with his mighty yet slow corpse, Minos Prime is fast, agile, and even more durable and deadly than anything in Act 1. ^note While Hideous Mass has more HP than Minos Prime, that's undercut by taking triple damage when its weak-points are attacked He made V2 and Gabriel look like total pushovers.
• Messianic Archetype: Wears a crown of thorns, his beliefs are based on love of one another and the forgiveness of one's sins, doesn't fight back when he is to be killed, and is cherished after his death.
• No Good Deed Goes Unpunished: He turned a layer of Hell into a paradise out of compassion for its sinners, only to be struck down by the forces of Heaven. Then things go downhill from that point on.
• O.O.C. Is Serious Business: Pretty much all descriptions of King Minos have described him as a kind soul full of compassion for sinners, who was slain by Gabriel because the angel took advantage of his kindness. So when the first words of Minos Prime upon manifesting are said with such venom and rage, you know that he's been changed by the experience.
• Our Souls Are Different: Prime Souls are souls born from sheer will that become so powerful that even angels fear them.
• Pre-Explosion Glow: Beams of light come out of him before he perishes.
• Rasputinian Death: Minos dies a grand total of four times in Ultrakill: once on Earth before he became a judge of Hell, again when Gabriel slew him and ended his revolution, then V1 kills his corpse, and finally Minos is Killed Off for Real when V1 destroys his soul.
• Sealed Good in a Can: The soul of a just ruler who was sealed away in the Flesh Prison for eons until V1 frees him.
• Snakes Are Sexy: King Minos has a snake motif as a reference to his poem counterpart, and not only does he have a handsome appearance, he rules the Lust Layer as The Good King. His muscular Prime Soul is well-built like a bodybuilder, and his arms are coiled by ethereal snakes. He even has official body pillow merchandise with one side depicting him surrounded by rose petals, while the other side has him strike a Ready for Lovemaking pose in all his muscular glory.
• Snakes Are Sinister: Inverted. King Minos has a snake motif, yet he's a kind and selfless king who seeks salvation for his people.
• Superboss: Minos Prime can only be unlocked by P-ranking Prelude and Act 1, followed by defeating Flesh Prison, who is also this trope. While he solely exists to be an optional yet challenging boss, boy does he deliver. Not only does he take and dish out way more punishment than V2 or Gabriel, but he's also the fastest boss of Act 1. Only the bravest and most skilled players have a chance to defeat him.
• Technicolor Fire: In his second phase, Minos Prime is surrounded in blue flames.
• This Is Unforgivable!: While Minos is grateful for being freed by V1, he can not forgive them and their kind for being involved in humanity's extinction, and he will kill V1 for that.
• Tragic Hero: A benevolent king who was murdered by a self-righteous angel, had his soul sealed away in an Eldritch Abomination, watched his undead corpse undoing his and his people's work, freed by a Killer Robot, and get permanently killed by said robot, King Minos is a good soul who was unfairly punished, suffered for an eternity, and met a cruel death at the end.
• True Final Boss: Of Act I.
• Turns Red: Once half of his health is gone, Minos' attacks get even more aggressive, complete with a cloak of blue fire.
• Ungrateful Bastard: Averted. He's genuinely grateful to V1 for freeing him, but given the machines' genocide of everything that lives on Earth, he is unable to forgive them and attempts to kill his rescuer.
• Universally Beloved Leader: King Minos was beloved across the Lust Layer for his reformation of their eternal punishment. So beloved, in fact, that angels feared that after his death, Heaven feared that the belief in Minos was too strong, to the point of his soul becoming a Prime Soul, and thus locked him away in the Flesh Prison.
• Walking Spoiler: You are not supposed to learn about his soul's existence until you defeat the Flesh Prison.
• We Hardly Knew Ye: The poor soul only serves as a single boss fight, which doesn't survive.
• Ye Olde Butcherede Englishe: He speaks this way, as shown in his quote above.

Level P-2 First Bonus Boss

Flesh Panopticon

Rank: Unclassified

A towering creature made of Heaven magic and Hell energy. Just like its predecessor, the Flesh Prison, the Flesh Panopticon also serves as a prison for a Prime Soul.

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• Anti-Regeneration: Its gaze turns all damage taken into permanent hard damage. This is indicated in the HUD by the hard damage meter turning yellow.
• Bait-and-Switch Boss: The Flesh Panopticon is set up just like the Flesh Prison before it. But while there is some fighting with it, the battle doesn't last long. If its first of two health bars is depleted by half or it's given an opportunity to try and heal itself, Sisyphus will interrupt it and violently break free, killing it instantly.
• Critical Existence Failure: Averted; The Panopticon was barely enough to contain the Prime Soul of Sisyphus constantly thrashing around inside it. When it's lost a little over a fourth of its integrity thanks to V1 fighting it, the prison gives out.
• Eldritch Abomination: It's a living flesh cube on top of a stalk with a horrific toothy mouth that goes all around it and a plethora of eyes everywhere.
• Faceless Eye: Summons floating eyeball minions.
• Flunky Boss: Just like the Flesh Prison, the Flesh Panopticon can also summon eyes to help it in battle. Its summons are less numerous than those of the Prison, but they're more resilient, fire explosive beams, and their gaze prevents V1 from healing.
• Heal Thyself: Subverted. If its health isn't depleted enough for Sisyphus to kill it himself, then he'll break out when it tries to heal.
• Leitmotif: "PANDEMONIUM".
• Light 'em Up: Like Flesh Prison, it can cast holy light pillars similar to the Virtue; unlike Flesh Prison (and Virtues), it can cast them horizontally.
• Macross Missile Massacre: Sort of. Its most dangerous attack is a barrage of homing, exploding fireballs. They not only do a lot of damage, but turn all normal damage they do into hard damage, severely limiting your ability to recover.
• Stationary Boss: Since it's a tower consisting of a cube on a stick, the Flesh Panopticon doesn't move.
• Trick Boss: It has barely any effective health; as soon as its first health bar is depleted by half, Sisyphus interrupts the fight to destroy the Flesh Panopticon and escape. Downplayed since the Panopticon has dangerous attacks of its own to stand on.
• Turns Red: Its attacks become more powerful during phase 2. However, it can only be seen in sandbox mode.
• The Worf Effect: The Flesh Panopticon is noted in its terminal entry to be a superior version of the Flesh Prison used to hold Minos's soul. However, the soul of King Sisyphus is so powerful that the Panopticon can just barely contain it, and so Sisyphus is able to break out the moment the Panopticon suffers enough damage.

Level P-2 Second Bonus Boss

Sisyphus Prime

Rank: Prime Soul

^{Greed Insurrection-era Sisyphus}

"Come forth, child of man, and die."

Voiced by: Lenval Brown

The pure soul of King Sisyphus. Similar to King Minos before him, Sisyphus became an indestructible Prime Soul sometime after his death, requiring him to be sealed within the Flesh Panopticon. Upon his release, he muses about how Heaven has forgotten him and that he is "EAGER to make them remember", before engaging V1 in combat.

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• Acrofatic: Depicted as having a rather round midsection, yet he's even faster than Minos Prime, who is skinnier than him.
• The Anti-Nihilist: Although he knew full well that his rebellion against Heaven had zero chance of conquering Greed, let alone taking on the whole host of Heaven's armies, Sisyphus remembered the spite he had garnered from an eternity of pushing a boulder up a hill and falling back down to take joy in the simplicity of rebellion against authority itself and not worry about the consequences. Sisyphus permanently dies saying that he regretted nothing, even though his fight was All for Nothing.
• Attack of the 50-Foot Whatever: His husk is as big as Minos's, but by the time V1 finds it, it's inactive, being decapitated, restrained, and encased within Greed's largest pyramid. Meanwhile, even though his Prime Soul is significantly smaller, he is still twice as tall as Minos Prime (who himself is twice as tall as V1).
• Baritone of Strength: Has arguably the deepest voice of the speaking cast of the game and can back his register by cashing the asses of the unfortunate souls unprepared for him.
• Bitch in Sheep's Clothing: Downplayed, but it is explicitly stated in terminals that while he was genuinely committed to the idea of fighting against the oppressive reign of Heaven and he made a justified argument for people to follow his lead, his motive to do so was purely out of self-interest stemming from his deterministic philosophy that would always be willing to take on the impossible even if he doesn't have the slimmest chance of victory... thus, he set up a rebellion that would, as he already believed, fail anyway and get numerous members of his rebellion slaughtered en mass by Heaven simply because it was what he wanted to do rather than for any practical reason and doesn't regret leading them all to the slaughter. That said however, upon his resurrection as a Prime Soul, he does make his intent clear to finish what he and his followers started, which implicates a measure of Hidden Depths that has him at least wish to avenge his fallen comrades even if he was the one who led them to die to begin with.
• Blood Knight: After being released from the Flesh Panopticon, Sisyphus Prime fights V1 because he wants to test their combat skills after learning that they defeated Minos Prime. His entry also states that, despite knowing fairly well that his rebellion would fail, he kept at it with a smile on his face up until Gabriel lopped off his head. Sometimes, when you respawn, he'll eagerly voice his approval of V1's return.
  "Keep 'em coming!!"
• Bring It: Depleting 75 percent of his health will cause him to occasionally stop attacking and perform a gesture like this. Depending on how hurt both he or V1 are, this is either a split-second opportunity for you to get some serious damage in or accidentally get cocky and waste your strongest attacks on him before he genereously returns the favor threefold.
  Sisyphus Prime: Nice try.
• Calling Your Attacks: He yells specific lines for his attacks, just like with Minos Prime before him. As usual, use them as warnings.
  BEGONE: A thunderous clap that creates a vertical shockwave. This attack can be parried.
  DESTROY: Throws a projectile made of gold dust that explodes on contact.
  YOU CAN'T ESCAPE: 5-hit combo. He thrusts his palms twice, then thrusts his knees twice, and finishes it off with a sumo stomp that creates a shockwave. The stomp can be parried.
  THIS WILL HURT: After a brief window, he lets out an explosion with a massive blast radius from his body.
• Canon Immigrant: ULTRAKILL can be considered a very loose adaptation of The Divine Comedy, based on how it sticks largely to its interpretation of Hell, from King Minos' presence as a judge of Hell to the capital of Dis being set in the layer of Heresy. However, Sisyphus is not mentioned even once in the original poem. Surprising, given Dante's penchant for including figures from Greek mythology in his work and the fact that Sisyphus is one of said mythology's most notorious sinners.
• Combat Sadomasochist: Knocking off his first health bar will cause him to both literally and figuratively turn red, but unlike Gabriel who does so out of anger, Sisyphus is clearly getting worked up because he's enjoying himself so much.
  Sisyphus: Yes...THAT'S IT!
• Deader than Dead: Like Minos Prime, the fate of destroying Sisyphus' Prime Soul is permanent death.
• Decapitated Army: His army was actually doing pretty good at fighting the Angelic horde, but once he was felled in battle, his insurrection soon followed suit as his soldiers were in a disorganized panic ripe for the slaughter.
• Determinator: This is entirely why he rebelled in the first place despite knowing what would happen; while he knew actually defeating Heaven was impossible, he believed that rebellion against oppressors even with the knowledge of its inevitable failure was the ultimate victory against the oppressor.
• Determined Defeatist: Sisyphus knew his insurrection against Heaven would fail, but that didn't stop him from fighting with all of his might.
• Die Laughing: As opposed to Minos's prolonged scream of agony as he dies, Sisyphus goes out laughing.
  "So concludes the life and times of King Sisyphus...a fitting end to an existence defined by a futile struggle. Doomed from the very start...and I don't regret a SECOND of it!" (Belts out some Evil Laughter before he dies).
• Difficult, but Awesome: Sisyphus Prime has attacks that are a lot faster than Minos', but the counterbalance to that is that a lot more of them are parryable, meaning a skilled enough player can basically counter most of his attacks and take off huge chunks of his health bar rapidly. Note, however, that many of Sisyphus' attacks are similar to Minos' parryable attacks in that while they are parryable, parrying them doesn't negate the damage from the attack and V1 still needs to dodge out of the way.
• Doomed Moral Victor: Somewhat interestingly so, in that he knew he was Doomed with a capital D from the very beginning of it all. He was fully aware his rebellion against Heaven would fail and that he and everyone else would be cut down in the process. He kept going after Heaven even in death, despite being utterly unsurprised he never got that far once killed. Sisyphus is someone that rebels against the tyrants above not because he wants to help, nor because he thinks it'll work. He does it because, just as when he was pushing that rock despite knowing it would roll back down, standing against tyrants even (perhaps especially) when it's pointless is what is Right.
• The Dreaded: Sisyphus Prime is kept behind multiple locks and failsafes, and the entrance to P-2 is well hidden in the City of Dis. Furthermore, in contrast to the pacifist Minos Prime only being guarded by the Flesh Prison, Hell throws everything it has at you to keep V1 from reaching and freeing Sisyphus. This man is bad news, and all of Hell knows it.
• Evil Is Bigger: His Prime Soul towers over V1 and Minos Prime, and while he isn't truly evil, he's still a savage Blood Knight with loose morals.
• Face Death with Dignity: Despite knowing his insurrection is doomed to fail no matter what, Sisyphus Prime proudly laughs in the face of death after V1 defeats him because the mere act of rebellion is enough to bring him joy. One must imagine Sisyphus happy.
• The Faceless: Mimicking his beheading, he has no head, instead having an opaque glowing ball atop his neck with a rough impression of his face.
• Flash Step: He moves so fast that he doesn't even leave particle trails when he's in a new position.
• Foil: Sisyphus's violent insurrection is contrasted with Minos's peaceful revolution. Minos had great compassion for his people and built a paradise where they could thrive whereas Sisyphus risked letting his followers die while knowing that their rebellion was futile. After they break free of their containment, Minos's words are venomous and spiteful towards Heaven, seeking to kill V1 for their hand in the end of humanity, while Sisyphus is rather tranquil in his declaration of destroying Heaven, picking a fight with V1 because he knew they had killed Minos earlier and wants to test himself against the Machine before resuming his insurrection. When Minos dies, he sorrowfully apologizes to humankind for his failure to avenge their deaths, but when Sisyphus dies, he proudly declares he didn't regret a second of his life and goes out laughing.
• Graceful Loser: Upon his defeat against V1, Sisyphus seems to be despairing about how futile his struggles were… Only to proudly proclaim that he regrets nothing before letting out a maniacal laugh of pride until he dies for good.
• Hope Bringer: Sisyphus's insurrection inspired hope in an outright hopeless realm, giving his followers something to believe in for once after an eternity of punishment. Sadly, this didn't last long, as his army is swiftly defeated once he is slain.
• Humanoid Abomination: His Prime Soul is a glowing, translucent, towering humanoid being with a sun for a head, a visible circulatory system, has sun-based powers, immense strength, and blistering speed. He's even stronger than Minos Prime, who's already this trope.
• I Regret Nothing: In spite of acknowledging his life as defined by futility and failure, Sisyphus declares this proudly.
• Jacob Marley Apparel: His soul is missing its head, replaced by a miniature sun with the vague impression of his face. His hands and feet are still soaked in the blood of his enemies just as they (and those of his Insurrectionists) were during his uprising.
• Leaning on the Fourth Wall: When the player respawns to re-engage him, he remarks "Keep them coming!" as if to imply he's either fought many machines like V1 before, or he's actively aware of V1 respawning.
• Leitmotif: His theme, "WAR", contains a nod to "Sands of Tide", the theme of stage 4-2, which, much like Minos Prime, contains passages that allude to Sisyphus' backstory as well as the history of Greed, the Layer he came to preside over.
• Light Is Not Good: Downplayed. Sisyphus Prime is a humanoid soul that's shining with golden light. While he isn't truly evil, he's still a vicious, unscrupulous Blood Knight who's willing to let his followers die in a rebellion he knew would fail, a stark contrast to the good-hearted Minos Prime. Despite his vices, Sisyphus plans to finish what he started and avenge his fallen comrades, even though he knowingly led them to their doom.
• Lightning Bruiser: If you think Minos Prime is hard, Sisyphus Prime is so fast that he doesn't give you milliseconds to react in time, all on top of having bulk and immense strength.
• Messianic Archetype: He's a bearded, long-haired man with a dark complexion, his domain is a desert, he gets persecuted by religious zealots for finding his radical views blasphemous, he brought hope to his people, and his corpse's arms are outstretched as if he's been crucified.
• Off with His Head!: He was decapitated and crucified within his tomb.
• Our Souls Are Different: One of the two Prime Souls formed from an immense will. He's even stronger than Minos Prime to the point that he's heavily guarded by the Flesh Panopticon and everything else that Hell can throw at V1.
• Pre-Explosion Glow: Beams of light emerge from him before he dies.
• Posthumous Character: Sisyphus is long dead by the time V1 enters Hell. Unlike Minos, Sisyphus' body is inactive; it's encased within Greed's largest pyramid without its head.
• The Power of the Sun: His soul's new face is a miniature sun, he can create small supernovas around himself, and even for metaphorical theming he was king of a layer cast in eternal burning sunlight as well as being the center of his army that all soldiers revolved around and looked to.
• Pragmatic Hero: His terminal entry quickly states that, unlike the noble and gentle Minos, Sisyphus would very quickly take to more unscrupulous means to protect his comrades. When God had disappeared and Heaven went into a panic, he took this moment to hold his rebellion, even if he knew it would fail, taking advantage of the disarray.
• Rage Against the Heavens: Sisyphus's insurrection was this on a layer-wide scale, but it failed once the angels made a concerted effort to strike them down. Terminals state that, even if his rebellion died, he still felt he had won, as he had still managed to rebel against his oppressors even when he knew he would fail in the end.
• Sealed Badass in a Can: The soul of a valorous yet shady king who was sealed away in the Flesh Panopticon for eons until V1 frees him. Unlike Minos Prime, the Flesh Panopticon was barely enough to hold him.
• Stout Strength: Compared to Minos Prime's more standard athletic build, Sisyphus Prime's frame has the fat to sustain long periods of physical activity he'd need to carry boulders up hills for hundreds of years, and he makes it abundantly clear by having two health bars and being slightly faster than his contemporary.
• Superboss: If you want to test your mettle against Sisyphus, you must first obtain a P rank in every level of Act II, and defeat Minos Prime, who is also himself this trope. If you manage to do this and then survive the most grueling and difficult combat encounters the game has to offer as of yet, then congrats, you've earned the right to meet Sisyphus in battle.
• Tranquil Fury: His is a very settled and becalmed sort of bloodthirst, whether he's stating his intent to mangle you solely as practice, or pondering just how eager he is to tear down Heaven with his own bare hands. He only raises his voice when the battle gets him excited rather than simply thirsting for vengeance.
• True Final Boss: Of Act II.
• Turns Red: When you deplete his first health bar, he begins regaining more features of his head, primarily his long hair and full beard.
• The Unfettered: Unlike Minos, who has a strict code of honor, Sisyphus is willing to lie, cheat, and kill if necessary to achieve his goals.
• Ungrateful Bastard: Also unlike Minos, who at least thanks you for freeing him before pummeling you into scrap metal, Sisyphus repays your help with the ass-kicking of your life without expressing a shred of gratitude.
• Wham Line: Partway through the fight with the Flesh Panopticon, the fight abruptly stops. Suddenly, you hear a booming voice say, "This prison... to hold... ME?" Cue Sisyphus Prime tearing his way out of the Flesh Panopticon, utterly destroying it within seconds.
• Worthy Opponent: Once again, unlike Minos, who challenged V1 for the crimes against humanity they've selfishly committed, Sisyphus just wants to fight V1 because he can sense they've already killed Minos, and he wants a warm-up battle to see their skills before going on a Roaring Rampage of Revenge against Heaven.