Every minute or so the boss would release a disruption wave removing all buffs(ALL) from the raid members.
In addition to removing the buffs on the raid he will be able to remove the debuffs on himself.
They would be able release all their magic in one spell obliterating nearly everyone.
They would then restore their mana too full.
When boss's get low on health they would restore 1/8 or more health with one spell and they can do this... repeatedly.
They would have multiple forms. The first form would be cute/evil looking the second form would be insanely demonic.