Azmodan

From Diablo Wiki

Azmodan, the Lord of Sin is one of the four Lesser Evils which make up the seven Great Evils. After the Dark Exile when the three Prime Evils were overthrown into the mortal realm of Sanctuary, Andariel and Duriel also traveled to Sanctuary to aid them in their plans, thus leaving Azmodan and Belial as the only remaining Great Evils in Hell. Since then a civil war has broken out among the denizens of Hell, the two warring factions, one led by Azmodan and one by Belial both vying for control of Hell. Currently Azmodan's physical appearance is unknown as he has not been present in the Diablo series so far.

Great Evils
Prime Evils	Baal • Diablo • Mephisto
Lesser Evils	Andariel • Azmodan • Belial • Duriel
Other Evils	Lilith • Lucion • Kabraxis • Xazax • Astrogha • Assur • Gulag