Like the Monk Job quest lv60! That was awesome!
You have to get a certain boost so you do 10x more damage as usual, cause that boss was so damn powerfull!
Also it was needed to beat all those nonstop coming adds attking your befriended NPCs! O:

Or how about this: (I just had this idea)

Schoolars Fairys Eos and Selene want some "fun"!
Boss fight: Battle Arena turns complete in dark due Bad Selenes'. Very small view and Some traps everywhere.
Also: that means: cant target the boss, nor can see the whole arena, just 1-2yards :P

Tank have to keep boss his attention! And prevent party gets hit by boss AoE that gives negativ status: Fear! (Tank is imun)
4-6 friendly Eos's appear around the arena. You can see there glowing everywhere! But look out for traps! They are hurting and makes you slow (Weight, Paralyze) :P
DPS's and/Or healer have to negotiate with all Eos's so they bring the light back for a certain amount of time ->
Boss is weakend and can be attacked by party, but that monster is a being living in the dark, so its blinded -> Cant atk the party!
But those mean Selene's(not targetable!) will atk party instead and giving annoying negative status'! ;o

And so on: Light turns out and the mechanic starts from new!
Untill... Boss have 25% HP left and starting to get desperate and angry... Arena is getting dark again.
But no Eos's appears this time though. Because Selenes captured them! :P
Meanwhile... The Boss turns into a bright glowing red monster and gets damage/defence/speed boost and is rampaging! ->
But party can atk him!

I have tons of ideas! @.@ ...to bad I dont work for this game )=