Known simply as "Da Boss" by the awed Stormboyz who flock to his banner, Zagstruk's thermonuclear temper is legend. He never lowers his voice below a bellow, and can fly into a murderous rage with no provocation whatsoever.

Warboss Zagstruk atop his bionik Da Vulcha's Klawz.

Zagstruk is well-known for his characteristic wargear, Da Vulcha's Klawz. After confronting a Space Marine Dreadnought unsuccessfully, both of Zagstruk's legs were ripped off.