Many of his TP Moves are modified: Grand Slam has an increased AoE range. Lightning Roar has an additional effect of stun, and catapult has been replaced with Trebuchet.
The fight is nearly impossible to win without using the weakening items as His Auto-Regen and attack power is VERY high.(Trebuchet hit as high as 4,500.)
It is recommended that melee sub ninja, as it is possible for Grand Slam to kill someone at full hp. Mages should also stand at max casting range.