Morbai appear as large, fly-like demons with tattered wings. Their heads are insectoid, with great compound eyes and dripping mouthparts. They spread clouds of disease behind them as they pass.
Morbai revel in squalor, favor kings who use plague as a weapon of war, and assassins who kill with poison. They attempt to goad mortals into doing all of these things, and they themselves spread plague as well, leaving disease in their wake wherever they go.
Choleric demon-kin of Morbai have dark, multi-faceted eyes; tattered insect wings; and favor using poison and disease to destroy their enemies.