Shin Megami Tensei: Digital Devil Saga

The final obstacle before the last boss. He can easily kill you if you don't have the right skills, as he gets seven, yes, SEVEN attacks per turn. Null panic and nerve are essential in this battle, as he casts stun and sonic wave quite frequently, but seeing as you've nulled their effects, that only leaves him with physical attacks, which can easily be healed. If he starts boosting his stats up, use dekaja on him to stop him doing more damage to you. Not a lot else here really, just ocntinue attacking him until he falls.

P.S, Heat owns in this battle!