Activated upon death, they will become invulnerable to damage going into negative hp. Within this form they will become berserk, unable to do anything but ferociously bombard the enemy which dealt the last fatal hit. Along side becoming invulnerable they will become immune to all negative status affects, but also positive status effects (including healing) . Any enemy or ally who tries to break their engagement with the opponent who dealt the final hit, will also be targeted. Once all opponents who are being targeted are killed or die, the user will revert to their original form exhausted and on 1 hit-point unable to do anything, having a timer for 10 turns until they melt in consequence for pushing their limits. During this final form they can not be targeted, hurt or healed. But if a revival spell is used upon them they will return to their true form again able to fight.
If the enemy which deals the final fatal hit has damage above the users hp, the user will start to melt indefinitely for 10 turns, within this form they will be able to only pummel the enemy dealing the same damage as a regular punch, but in consequence dealing recoil damage to them self. (Same rules above apply.)