I would make Hell the equivilent of a Giant Monster and give him the following powers:
<span style="FONT-WEIGHT: bold">Death Star:</span> You summon an enormous ball of negative energy that destroys everything within the radius of the impact. Click
Gehenna: The flames of Hell errupt around you, incinerating anything foolish enough to be caught in the blast. Click
<span style="FONT-WEIGHT: bold">Armageddon: </span>You summon multiple demon overlords and lich's to do your bidding. They will seek out and destroy your enemies. Click
<span style="FONT-WEIGHT: bold">Oblivion: </span>The soul of any fallen foes around you are ripped from their bodies and absorbed by you to increase your power. Toggle
MUWAHAHAHAHA