History ThatOneBoss / TalesSeries

* Captain Schwann. Your party is missing its two primary healers: Estelle [[spoiler:(who's [[DistressedDamsel being held captive]] by Alexei)]] and Raven [[spoiler:(who is ''the boss you're fighting'')]], and he will take full advantage of that with devastating strike artes and a hard-hitting [[LimitBreak Mystic Arte]] that's likely following the killer combo he just pulled on your party since he was in [[TurnsRed Over Limit]].

** The fight against the summon spirit [[MakingASplash Undine.]] Her strategy is to back the party into a corner, and beam-spam the water spell [[ThatOneAttack Spread]], which hits every party member in a four-foot radius five times each. She also has a whopping [[DamageSponge 36,000 HP]], and a brutally fast 5 second cooldown after casting spells. Thankfully, most the other summon spirits are pretty easy to deal with, with the one major exception being [[BonusBoss Origin.]]

* [[spoiler: Volt]] is a '''very''' annoying/tricky boss to defeat in this story (He was quite manageable with enough preparation before, [[spoiler: unlike this variant of him]]) if you haven't grinded up your party's skills in advance, as he can easily mop the floor with you if you don't learn the new Power Hits mechanics to take him down quickly enough. He '''loves''' to jump around, making moderate-sized electrical shockwaves around your party, weakening/KOing them with ease most of the time as well as firing a full 360 electrical laser that spans the entire battle area. Hope you unlocked Ludger/Alvin's "Bullet Fiesta" linked arte as it REALLY can save your ass in this fight '''big time''' when used effectively on him since, unlike the other [[BonusBoss optional bosses]], this one is '''directly''' tied to story progression, so... good luck.

* Lord Ganabelt, the ruler of Cyslodia. His speedy attacks render Rinwell's charge attacks largely useless, he creates clones of himself that can cause even more chaos and damage to your party, and worst of all is his Mystic Arte, "Indignation". It's an unavoidable, unstoppable AOE (for every difficulty past Story), that will utterly wipe out your party except for Alphen if he's of sufficient level AND at full health. You will not only have to spend several moments struggling to revive your party ''but'' you will also have at most, ''four'' Gananbelt clones to deal with aside from his vastly more powerful move set now that he's in his second phase.

* Hasta. As if his pre-battle cutscene ramblings haven't disoriented you (and the party) enough. Hasta has nasty offensive and defensive power to begin with, and this is made worse by his WeaponOfChoice, meaning he has wide range for his attacks. The DS version was even more merciless with him, since he brought monster companions and appeared at the end of extremely frustrating dungeons.

* Before you fight Vholran, you must fight a FlunkyBoss... and the FlunkyBoss summons ''another'' copy of itself. It then proceeds to merge, bringing it back up to full health. And both of these forms are quite [[DamageSpongeBoss spongy]], meaning that on any difficulty above Story you must go through roughly 200,000 HP of damage. The only mercy is that it's weak to dark damage and has a core you can attack to weaken it.

* The Anomalous Orb bosses are basically like the [[EtrianOdyssey F.O.Es]] of this game. They act like other random encounters except they look different (with a very visible dark aura around them), don't chase you down like other random encounters, and tend to be far, far more powerful than anything else you can encounter up to that point, and probably for a while to come too. Trying to take these things on when you can first fight them is either downright suicidal or insanely difficult.

* Even if you've had little trouble with previous bosses you may have difficulty with [[spoiler:Maltran]] due to her high speed, longer reach and tendency to chain her attacks together, leaving you little room to counter.
* The DualBoss against [[spoiler:Rose and Zaveid]] in a seemingly innocent sidequest in the late-game can be a nasty surprise to many players. You lack two characters in the party [[spoiler:(because they're fighting you!)]] and thus lacking a second armatize-capable character. The two of them pull fast and heavy-hitting combos that could stun-lock you to oblivion in short order, especially with [[spoiler:Rose and her Mystic Arte-happy AI]]. Your only hope of winning is to take [[spoiler:Rose]] out of the fight as quickly as you can before you get overwhelmed by their combined attacks, and then you can focus on [[spoiler:Zaveid]], who isn't as merciless by himself but can also be pretty tough to deal with. What's worst about this fight is that there's no warning at all that it's going to happen. The only thing stated in the objective is just to go back 'to where you first met Rose' and that's it, meaning that many players would be taken completely off-guard by one of the toughest boss fights in the game.

'''NOTE''': FinalBoss and WakeUpCallBoss can't be added unless they are overpowerful by ''their'' standards. BonusBoss is completely banned: it's optional and they are supposed to be overpowerful in the first place.

* [[spoiler:Ange and Albert]] in Tenos. A DualBoss where one is a fast and powerful melee fighter who can also heal, and the other is a ranged attacker who's constantly interrupting your team and can cause StandardStatusEffects. And as an added bonus, you're short the party member who was probably your main healer.

* The Slime Queen. The queen itself is not that hard, but the slime enemies she summons can poison your characters and easily gang up on you if you're not prepared. Since a lot of the boss fights in this game are [[FlunkyBoss Flunky Bosses]] that can inflict StandardStatusEffects, the Slime Queen also serves as a WakeUpCallBoss.

** [[https://killapenguin.com/progresslog/jrpg-tales-of-vesperia-gattuso-too-hard/ This blog post]] criticizes the boss's high stats and annoying abilities, and also discusses how a particularly bad ThatOneBoss can drag down an otherwise enjoyable game.
* Belius. The boss has powerful spells and an attack with a wide reach. The fight gets even more difficult midway through when Belius causes the arena to go dark and spawns a clone of herself. While you only have to kill the original to win, it was bad enough just having to deal with one Belius, rather than [[DualBoss two]].
* Clive, Tison, and Nan. They're the first bosses whom you'll fight who introduce Mystic Artes proper, at a point where only [[MightyGlacier Karol]] can learn his. Tyson is a horrendous nightmare who can zoom around the field and even strike Estelle or Rita from afar to interrupt their casting. Nan's even worse, though, as she can use her boomerang blade to disrupt your party from any range, and she can heal for a bit. You'll think ShootTheMedicFirst, right? Well, that is risky. Her Mystic Arte has the potential of taking down more than one target if she initiates it when standing too close to many. But the absolute '''worst''' of them is ''Clive,'' who goes into Overlimit more often than he has any business doing and has a Mystic Arte that OHKOs up to '''three party members at once.''' Run into these three jackasses in the Labrynth of Memories? LOL, have fun kiddies! Hope you've stacked up on Life Bottles.

** Fortunately, this is [[AuthorsSavingThrow alleviated]] in the [=PS3=] and definitive edition - in which the party has Flynn and Patty with them. This means you have four characters with healing artes (Yuri, Karol, Flynn, and Patty)

* Clive, Tison, and Nan. They're the first bosses whom you'll fight who introduce Mystic Artes proper, at a point where only [[MightyGlacier Karol]] can learn his. Tyson is a horrendous nightmare who can zoom around the field and even strike Estelle or Rita from afar to interrupt their casting. Nan's even worse, though, as she can use her boomerang blade to disrupt your party from any range, and she can heal for a bit. You'll think ShootTheMedicFirst, right? Well, that is risky. Her Mystic Arte has the potential of taking down more than one target if she initiates it when standing too close to many.But the absolute '''worst''' of them is ''Clive,'' who goes into Overlimit more often than he has any business doing and has a Mystic Arte that OHKOs up to '''three party members at once.''' Run into these three jackasses in the Labrynth of Memories? LOL, have fun kiddies! Hope you've stacked up on Life Bottles.

* Tison and Nan. They're the first bosses whom you'll fight who introduce Mystic Artes proper, at a point where only [[MightyGlacier Karol]] can learn his. Tyson is a horrendous nightmare who can zoom around the field and even strike Estelle or Rita from afar to interrupt their casting. Nan takes the cake, though, as she can use her boomerang blade to disrupt your party from any range, and she can heal for a bit. You'll think ShootTheMedicFirst, right? Well, that is risky. Her Mystic Arte has the potential of taking down more than one target if she initiates it when standing too close to many.

* Tison and Nan. They're the first bosses whom you'll fight who introduce Mystic Artes proper, at a point where ''you can't use your own yet''. Tyson is a horrendous nightmare who can zoom around the field and even strike Estelle or Rita from afar to interrupt their casting. Nan takes the cake, though, as she can use her boomerang blade to disrupt your party from any range, and she can heal for a bit. You'll think ShootTheMedicFirst, right? Well, that is risky. Her Mystic Arte has the potential of taking down more than one target if she initiates it when standing too close to many.

* Eleanor's final fight, mostly because if you slip up she can combo you into oblivion and not even give you a chance to recover.
* Kamoana. By that point, the bosses have been relatively easy aside from a few. Kamoana, on the other hand, can be a real trip-up to players who aren't on Normal or easy. She resists just about everything you got, does constant wind elemental damage, and can constantly push you into a corner - ''out'' of Magilou's healing circle. When she pushes you into the wall like this you also are staggered unless you guarded at the right time - and you're staggered for ''awhile''. Basically by that point, you have to really know the intricacies of this battle system.