The Drought

The drought is one of the first demons in the game. When you kill it the other demons know because they area all connected.

It is hinted that The Drought is a close friend of Varesh Ossa's personal demon "pet", The Hunger. Both have insisted that their allegiances are to Abaddon and possibly for a brief time, Varesh, as long as the Sunspears continue to foil their plans.