Hall of Penance

Hall of Penance is the third map of the Alternate Netherworld bonus stage in Disgaea: Hour of Darkness.

Strategy
This map has high level enemies, and a lot of them. The enemies are divided into 5 groups of 2 tot 5 enemies. To limit the amount of enemies you have to fight at once, you can focus your attention on one group and move all fighters in that direction. You might still lure out a couple extra nearby enemies, but most of them won't move until you actually near them.

If this map is giving you any trouble, it is recommended to either strenghten your equipment through the Item world or to level up your characters. A great place to do this, is Cave of Ordeal 3.