That One Boss 3.0 (or 4.0?)

[Tamanoir]

Out of curiosity, getting physically attacked while frozen isn't instant death, is it?

No, that would be petrified.

Frozen unts can't move and loses some HP every turns.

[Soapbar]

how could i forget.

[Shinehollow]

[spoiler=Devil May Cry 3 Spoilers]The final Vergil fight. It doesn't help when he spams helm breaker in Devil Trigger, or when he just goes off the screen completely, again in Devil Trigger.

[Walker]

Wiegraf from Final Fantasy Tactics War of the Lions.

How tough is this guy? You fight him three times. The first, his team is in the 10s to your 7s. It's horrible, but I beat him by rushing. The second, he shows up again (in a game with permadeath for most villains.) and starts massacring your team. I hit him with Flare AND Holy to stop him. That's just the warm up.

Then you have the fight with him in the end of Chapter 3. He fights Ramza (main character) in a 1-on-1. He does an attack which will do around 150 damage of your 200-something health and heals him the same amount. Immune to KO, too, by the way. You can deal (as a dual-wielding monk) maybe that much to his 400 health. You see the problem?

If you beat him, he one-wing angels into a demon (HP = ??? circa 500), and start summoning a megaflare-esque attack. Your party does show up at that point, but so do four Ultima Demons. Enjoy.

(The trick is to run in circles, healing and buffing yourself for 20 turns straight until you can ORKO him. But only a handful of set-ups can actually do that.)

Edited February 16, 2016 by StWalker

[Shadow Mir]

[spoiler=Mana Khemia Spoilers]Isolde. She gets turns rather quickly compared to most every other boss, and a lot of her moves are nasty. While the fight with her at the end of chapter 10 isn't too bad for the most part, the fight with her at the end of chapter 11 is, particularly when she takes enough damage. After she loses enough health, she uses Ancient Secret, which gives her three moves at once, which she uses to nail you with Choke, a Common Skill that damages the party and may inflict Silence, Thunder Rain, a Common Skill that, in addition to damaging the party, leaves four timecards (cards that automatically execute a skill when they get to the far right of the turn queue) behind after she uses it, and Grand Ray, which only hits one character, but it also knocks the hit character back on the visual action queue, thus making his/her turn come up later. She follows this barrage up with Gravity Burst, which takes two turns to execute... though between the damage being enough to one-hit anyone who isn't guarding and the aforementioned part where she gets barely any wait time on her moves, that doesn't matter as much as you think it would. The worst part? She doesn't hesitate to spam those moves. And most of her other moves have nasty effects, including, but not limited to, hitting the character with a lot of Break damage (indicated by a character's card turning red; once a character is Broken, they're stunned, their card may move back on the turn queue and the next attacks that are launched against that character become critical hits). And did I mention it's a really frigging long walk just to get to her to the point that it'll likely become night by the time you get to her (forcing you to wait since enemies, bosses included, are stronger at night)?

Edited February 17, 2016 by Levant Mir Celestia

[JSND Alter Dragon Boner]

Ice Dragon back in EOU1 seems to be kinda significantly nerfed. When i played it Fire Dragon was by far the hardest

Which is cool, because Ice Dragon drops arguably the best skill in the game