Superbosses serve as the end- and post-game content for the game, with nearly every update adding more to test the player. They have hundreds of millions of HP, stoppers to prevent bursting down with Another Force, and strong attacks that deal loads of damage without mitigation. The game also doesn't display their level, and you'll need a maxed-out team and specialized tactics to even stand a chance. Most yield rewards like some of the strongest equipment in the game or unique Grastas, and defeating them will certainly accomplish an achievement that comes with a good bounty of Chronos Stones.
- If you revisit the memories of dungeon zones of a major story chapter, you can fight a souped-up version of that chapter's Final Boss. You may even be fighting under remarkably different circumstances than the first round.
- Chance Encounters (denoted by red icons) are a series of challenging boss fights, but completing all of them yields a new character, or the 5-star advancements of certain story characters. The early ones are scaled for late- to endgame parties, while ones that are added later on require more optimization.
- Uquaji can be found in the Timespace Rift. He starts as a level 1 enemy with meager strength, but after a set time interval (or resting at an inn) he becomes stronger and wants a rematch. After enough rematches he scales past your party's level cap, going as high as Level 195. Defeating him at his strongest unlocks one last sidequest that adds him to your roster, and you get to fight a rematchable Uquaji Clan for Uquaji Coins to exchange for unique weaponry.
- The end goal of both Fishing Minigames is the ability to reel in Fishing Horrors, and the strongest among them can threaten to level the party if you don't bring your best. From the first minigame, you hunt down eight of them, four of which yield key items that eventually unlock the fight with the Leviathan, and its defeat adds Levia to your roster. From the second minigame, the strongest three targets are the Wyverus, Octulus, and Ishmaelithan, each of which carry a key item needed to upgrade the Abyss weapons, and the Ishmaelithan also holds Sheila's Valor Chant Grasta.
- Manifest Weapons come in two separate fights. The first is a watered-down fight that can be easily cleared with a competent team and yields the base-strength weapon on completion. The second is much harder, usually needing specialized tactics to defeat, so that the Manifest Weapon unlocks its full power. True Manifest Weapons get another rematch that's even harder, and this upgrades the weapon to another tier of power.
- The Battle Simulator has Extreme Modes for each of its stages. Extreme difficulty enemies are much harder than the regular versions, and will require specialized tactics to defeat, especially when you're trying to achieve the special objectives at the same time.
- Finish all of the Mayor's tutorials and he offers to spar with you while he's at his full power. He's not to be taken lightly.
- There's an NPC in Izana who can be paid 100,000 Git to investigate one of eight Dark Spirits. He'll take 30 minutes to present the relevant key item to initiate the fight, and its defeat yields a very strong Dark Spirit weapon.
- After acquiring the Jyomondo Key and speaking to the Dogu Master in Gadaro, you get to speak to certain dogu guarding doors scattered across the Antiquity Garulea Continent. Solve their riddles, and they open to lead you to a coffin containing a powerful enemy, and their defeat yields one of Miaki's weapons.
- In Nazrik, collect all ten Dirty Puzzle Pieces for a collector NPC in the outskirts of the city, and they will give access to manhole leading to an area where the player can re-challenge massively powered-up versions of the Dark Spirits and the dogu-guarded bosses from previous chapters. They possess huge HP reserves and their teamwork can make for a very challenging fight, but overcoming them nets the Void Weapons, which grant their wielders guaranteed Critical Hits.
- Completing both Persona 5 crossover events unlocks the Twins, Caroline and Justine, as incredibly difficult opponents when you revisit Lucniva. Unlike the other superbosses, they yield different rewards for surviving to different phases of their fight, including special Grastas and gear for the Phantom Thieves.
- After unlocking the 5-star classes for the first wave of Tales units, you unlock the True Spirit Trials that yield each characters' True Valor Chant Grastas. These bosses are almost as difficult as the Twins, sporting HP stoppers to keep you from bursting them down, and repeatedly altering Zones to tip the tide of battle when you least expect it.
- After unlocking the 5-star classes for the second wave of the Tales units, you get to rematch the boss that you fought to get their upgrade items. This time, it's a lot stronger than before, and defeating it in that state will yield two copies of the corresponding character's Valor Chant Grasta for upgrading.
- The Astral Archive provides bonus objectives to encourage players who are progressing through the story to explore more of the world around them. Completing all the objectives of each tome unlocks an optional boss that is moderately challenging. Defeating each of those will unlock a Challenge difficulty of the boss which encourages the player to build their party in a certain way and challenges them to deal as much damage to it as possible within 5 turns while surviving its attacks. Some of the later Astral Archive bosses, like Gariyu, hit so hard that surviving even one of its attacks is very challenging.
- Progressing the chapters of the "Song of Sword and Wings of Lost Paradise" Mythos will open up access to such enemies:
- Chapter 4 introduces the Unseen, located in a subsector of the southern Chasselas Crystal Region. Each turn, it sets up a barrier that reacts to a specific element, and hitting it with that element triggers a retaliation that hits the attacker for 9,999,999 damage. All the while, it attacks randomly, having enough stats to level the party even while debuffed, and when it hits low health it gets to attack twice per turn.
- After completing Chapter 6, the player will gain access to a series of Fetch Quests that unlocks the fight against Melozia, a shapeshifting superboss. In the beginning of the battle, it will take on Aldo's form, then it transforms into Thillelille and Prai in the second phase, and finally into Melina, Rosetta, and Mistrare in the final phase. The player needs to defeat the Aldo, Thillelille, and Melina copies respectively to advance the fight.
- The Future era has a set of eerie geometric-looking enemies which are actually artificial spirits made by the People of Paradise and dumped to the player's home planet due to flaw in their cores - Imbrium Basin in Last Island, Insula Ventorum in Macminal Museum's restricted area, and Terra Nivium in the basement of Sky Fortress Eeza. Like the Unseen, all of them have random attack patterns which make their movements difficult to anticipate...
...and then, after completing Chapter 8 of this Mythos, the player can fight massively powered-up versions of the bosses above in the Antiquity era alongside two more of them: Lacus Solitudinis and Sinus Aestuum. All of them not only retain the random attack patterns, but also have ability to overwrite Zones when the player least expects it.
- Clearing the Chrono Cross crossover at least once allows the player to access Another Spacetime Rift, with a goblin NPC that requires the player to circle around three times before it becomes willing to talk. Talking to it after that allows the player to challenge the Dragon God and Lynx in separate extremely difficult battles.
- The JP Fifth Anniversary update adds a sidequest that leads to Starky joining you, and following it to its end is a fight with Starky's manager, Lavoger, whose defeat yields Serge's personal weapon.
- Clearing the high difficulty Purgatory trials of "Home's Lost Atelier" Another Dungeon with 4.5 billion damage against each of Four Great Elementals will allow the player to challenge the shadow of Purgatory Mystical Beast in Spacetime Rift's Records Room. The boss is comprised of three parts: the main body, the coachman/driver, and the wings - the main body resists all elements, while the coachman and the wings can only be damaged by earth/water and fire/wind attacks each and absorbs other elements (including Non-Elemental attacks). Once the main body hits certain HP, it will copy the resistance of other parts alive, thus potentially making it a forced loss for player if both of other parts are still alive. In addition, the boss will punish the player during the odd turns if they move before the boss, requiring the player to time their offense depending on their party setup.
- "The Apex of Logic and Cardinal Scales" Mythos introduces five EPS series superweapons scattered across the Future timeline, and as you defeat each one you get to obtain and upgrade Curio's personal weapon.
- EPS-209 Murphy in Route 99 is a Super-Soldier that resists everything. The boss has two modes: it starts with annihilation mode where it will aggressively attacks the party for four turns while being protected by a barrier that reduces 90% damage and is immune against all status effectsnote , and stable/recovery mode for three turns where it will lose its barrier and immunity, but will put a nullifying barrier that needs to be destroyed within 20 hits while gaining a massive amount of HP regen. The end of annihilation mode also has it attacking using a non-mitigable attack that deals damage amounts to 90% of party members' maximum HP, so the party is expected to be solid at defense and offense alike to handle both modes.
- EPS-014 LeBlanc in Laula Dome is a gigantic earthworm with a main body and several sub-bodies referred to as "Protos", all of which have random attack pattern while cycling between different elemental weaknessesnote and absorbing other elements including Non-Elemental. The Protos also need to be defeated simultaneously before the main body can be attacked, otherwise they will keep coming back.
- EPS-245 Quadoxin in Nilva is a mutated abomination with thirteen stacks of Undying Curse that needs to be depleted before it can be properly defeated. It practically gets to move first even with a Speed debuff inflicted unless at least one Undying Curse stack is removed using a preemptive attack, and at the end of the turn it will stack offensive AND defensive buffs on itself, eventually becoming invulnerable if the battle goes on for too long. Furthermore, it will also inflict various crippling debuffs on the party with its attacks, making it particularly tricky to challenge.
- EPS-227 Patel is a chimera that starts the battle with 15 stacks of a personal buff that strengthens its defense and skills, and not wearing it down enough will result it entering "Awakening" state of different levels that will also heal it by large amount. It can also inflict different status effects that can make the battle to go south if they take out important party members.
- ARPX-Sophie is a Puzzle Boss on top of this. It may have low health and defenses, but it will revive when killed and it can do so indefinitely. The same goes for the elements that accompany it in battle. You end the battle not by depleting their health bar, but by doing enough damage to cancel the Charged Attack of each one, forcing the main boss to build up one of its unique stacks. After you hit 10 the battle ends in your victory.
- The "Wanderer in the Vortex" Apocrypha introduces a slew of these:
- Maze Village Arat has a side area where you can challenge additional bosses and build structures that can aid you in battle with them. The first, simpler variant of each boss is needed to access the True End of its respective chapter. You then unlock the Hard version of that boss, which is much harder and needs specialized strategy to defeat.
- After completing the True End of Chapter 4 of "Wander in the Vortex", you can also unlock a series of Fetch Quests to rebuild a Karakuri. When you first fight it, it's incomplete and therefore a pushover, and as you progress this you get rematches at different stages of completion, each more difficult than the last. When the Karakuri is fully built you're going to need to give it your all to beat it.
- Completing the true end of "Wanderer in the Binding Night" final chapter opens up a sidequest to battle a massively powered-up version of Time Anti-spiral, which not only possesses large reserve of HP, but will also revive a few times before it is defeated for good. The boss uses attacks those will (a) Fixed Damage Attack that can take up to 50% of your max HP, (b) will chip down your party's type resistances, (c) or after a few revives, use both successively in the same turn — yet on the other hand, you're discouraged from debuffing its ATK and INT too much until below 200 because its "Correction" auras will activate and instead supercharge it, guaranteeing a Total Party Kill. Triumph over it, however, and it will net Nona's personal armor and Another Style's VC Grasta.
- Also available after reaching the true end of "Wanderer in the Binding Night" is the "Blackbird" sidequest, which introduces Gatekeeper SD-148. While offensively much weaker compared to the Time Anti-spiral, it also has various troublesome gimmicks to make up for it such as preemptive Earth zone, status effects infliction, MP drain, and 50-hit count damage immunity barrier. Defeating it not only nets Almighty grasta for "Avenger" personality, but it will also open the "Edge of the Vortex" sidequest to unlock AS Noahxis.
- After clearing "Edge of the Vortex", the player can challenge the Warped version of its Final Boss, which has the habit of healing itself at turn-end if there are less than four party members in the frontline with the same elemental affinity, among other things. Successfully beating it rewards the player with AS Noahxis' VC Grasta.
- The first part of The Chronos Empire Strikes Back main story arc introduces a slew of these, mainly to highlight just how dangerous the Hollow Time Layer is. Aside from possessing innately high stats, the area they're fought at generally has severe weather and/or terrain condition that affects the battle, in addition to the passive Auras meant to discourage players from attempting certain strategies.
- The ultimate goal of the bounty hunting sidequest is to raise through the ranks and find clues those lead to the four Head bounties — the most dangerous criminals among the Meks. Defeating them nets the crests required to obtain some of the Elpis weapons. Furthermore, clearing them all unlocks an additional fight against the very same lowly bandit you caught on your first bounty, except this time the artifact he's pilfered off you has supercharged him. His defeat yields the Elpis Sword and completes the full set of Elpis weapons.
- If you've been a little thorough with exploration, one side dungeon will lead you to unwittingly awakening the Aspid, and it can be found out in the Vande Ocean after that point. However, confronting it unprepared results in Hopeless Boss Fight where your party will be unable to deal damage at all. Instead, the player has to go through a series of sidequests in order to weaken it first before being able to stand a chance, and defeating it allows the player to obtain Elpis Hammer.
- An additional update released in v3.0.500 adds an extra sidequest that allows the player to challenge Amal Gamal, a bizarre lifeform that seemingly takes traits of other lifeforms around it. Like one of the Head Bounties, it sports a large pool of HP and fought under the damage-reducing Phantom Mist climate. Not only does it pack a punch on its own, some of its passives also punishes the player if they attempt to Attack Its Weak Point. Defeating its full form nets the player with grasta for "Spicy Lover" personality.
- The second part of The Chronos Empire Strikes Back introduces even more superbosses to tackle at the end of its long sidequests, with powerful weaponry at the end.
- Once you've journeyed the lands to discover all six Legendary Treasures, Peros will speak of a final artifact to be discovered from a serpent sealed away in the center of the region. Although you have the Treasures empowering your party for a slightly easier time, the Calamity Serpent has three health bars and pulls no punches; the Treasures can also only empower you for so long before the Serpent starts to overpower them. Its defeat yields the legendary Dryad's Sword.
- Abominus is populated with powerful giant monsters that can wipe the floor with your Humongous Mecha unless you've hunted everything else to unlock its highest tiers of upgrades. The deepest reaches of this island hosts Megalowyrm Genesormr, which is a tough fight even for a fully kitted-out mech, and has five health bars and multiple stoppers where it retaliates by dropping a meteor on you. Its defeat yields the Bolt Core which is needed to unlock Hyuga as a sidekick.
- Again, the Extermination Jobs have a final fourth tier that needs you to hunt down very powerful monsters while fighting in extreme weather conditions, though accessing them is a lot simpler compared to some Omegapolis bosses. Defeating each yields one of the Dryad's weapons and you're awarded 20,000 Scratch points.
- After you've escaped The Blood Ring, returning to Entrana opens up a sidequest where you're tasked with investigating the craters where red meteors have crashed into the landmasses of Platonos. Inside each is a Lavog, which have massive defenses, two health bars each with a stopper, and they also summon adds to complicate the fight, as you have to kill a specific body to end it. After you've beaten all five, you trace them to their source in The Blood Ring and engage a giant Lavog using Guilty Hades. Besting this beast further upgrades Cyrus' personal weapon.
- The first part of "Wryz Saga" Episode introduces Death Eater Lindwyrm, which can be encountered hiding at fixed points of Wyrmrest Isle maps after the player unlocks the meeting with it after clearing the episode. This boss not only has Resurrective Immortality that makes it stronger offensively every time it revives, but it also needs to be fought four times in total before it finally goes down for good, each time restricting different elemental attacks and battle gimmicks. Triumph over it, and it will net the player with grasta for "Dragon Killer" characters.
