Imp Overlord is an imp boss. At the lowest Threat it has 960 health, hits for 22 and carries 4 armor; the uber version you meet in the Mortal Arena has ×3 the health and ×1.75 the damage. You need Overlord's Horn to call it out.

It waits at the end of Demon Gate, and belongs to Demon Gate.

Every kill rolls its list twice. 8 Uniques sit on it: four ordinary ones splitting 90.0% of it between them, and four Exceptional ones splitting the last 10.0%, which puts any one of those at about 1 in 40 of what it gives up. The Exceptional ones are The Open Door, The Hundred-Handed Court, Rifthunger and Doormaker.

It fights with Kings Chain, Rift Hunt and Break The Gate, and changes phase at 60% health.

It calls in Void Portal.