Thunderroc is a bird boss. At the lowest Threat it has 930 health, hits for 21 and carries 0 armor; the uber version you meet in the Mortal Arena has ×3 the health and ×1.75 the damage. You need Thunderroc Pinion to call it out.

It waits at the end of Skyreach Bastion, in place of Imp Overlord, 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 Fulgurite, The Stoop, Talonhook and Thunderroc's Halo.

It fights with Dive Strafe, Static Ring and Chain Arc, and changes phase at 60% health.

It calls in Static Chick.