He's this enigmatic being who has about 100000 HP. At the beginning of the battle he'll cast a barrier around himself so that none of your attacks can have effect on him. Not only that, he'll counter with 1300 damage while the barrier is on. At this phase his moves include either absorbing 1000 damage or putting your characters to sleep. If he was to put your characters to sleep however he'll use his next turn to split his barrier into four fire wisps, leaving him defensless. After that, those fire wisps will self destruct on you with their next turn dealing about 800 damage each. Then once the boss is barrierless with no more fire wisps he'll just conjure up his barrier and go through the same process all over again.
So how does that super boss sound?