Reminds me of the level up mechanic on some bosses in Abyssea and Voidwatch. Letting a boss level up too much = pretty much an impossible fight and the way they leveled always varied, for example Apma (Chimera) would level up every time thunder magic/WS hit it and that pretty much meant game over for your party, since even once is too many times. The way to prevent that was to stun his casting/don't cast on it (it's harder than you think to get people to not use a certain element cuz it's strong..) and pretty much exploit it's weakness.

Same with http://wiki.ffxiclopedia.org/wiki/Indrik, anyone who played XI at this time has fond memories of their first encounter with this. SE has it in them to make some interesting boss encounters, the problem lies with how they're going to handle people choosing to class stack instead of varied setups..

>__>