Which Final Fantasy Boss was the hardest (non-optional) up through 13

[Depression Moon]

Snake? I think the only boss that casted Mustard Bomb in IX was The Iifa tree's mist produce. Soulcage I think his name was.

[Loony BoB]

I love to grind. But the crystarium cap system meant that you couldn't overpower yourself in FFXIII. I have to pick a few out of that game for that reason - particular fights I had trouble with (until I learned the 'tricks' to beating them via the internet) were FFXIII spoilersCid and the Dysley fight where you have to attack him like crazy as he powers up.

[Darkwolf090]

Zemous FFIVJapanese/PS1

To make sure he doesnt one hit you you need to still the Dark matter from him... issue is that this is the old PS1 version/japanese so.... Edge cant steal anything at all almost.... So ya... and if you do get it he is still a pain in the ass.

Also in FFIV DS Golbez was kinda a pain but thats cuz i kinda screwed myself.... it ended up Cecil solo'ing Golbez cuz Cecil was like level 60 and everyone else was like 30 or 37 or something lol

[magemasher]

Yeah it was one of the 4 Guardians and first Memoria boss. It used to cast mustard bomb and kill you in 2 rounds with it if you didn't have body temp. It was a red and blue snake if I remember correctly.