Disgaea 5 - Overture of Downfall (Easy Method; Spoilers)
71Excluding Baal, the final fight in the pre-carnage dimension game is Overture of Downfall. Here you get Bloodis to join your party and unlock the carnage dimension, so it's obviously going to be a hard fight. However, since the overlord that comes to fight you is a prinny, he also has all the weaknesses a prinny has, meaning you can exploit their explosive evility.
To do this you really just want to get all the enemies together, usually a square will do it and then throw a prinny at the overlord. The prinnies level is irrelevant, so you can throw a level 9,999 or 1 and it will cause the overlord to explode all the same.
If all the enemies are close enough to the impact it will be enough to instantly defeat them. I mean, this video was done with all the enemy boost maxed and it made no difference.
TL;DR Throw a prinny at the prinny overlord to instantly win if they're grouped together.
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