Black widow

Black widows are an experimental terran explosive drone. They can detect psionic alpha patterns, swarm a target and then explode. After the End War they were considered to be a theoretical technology, but the Umojan Protectorate had functional models aboard the Keep.

When Terran Dominion ghost agent Nova Terra infiltrated the Keep, she triggered the black widows to attack her. Nova led them down a hallway of the keep, and shot the liquid oxygen tubes in the wall, freezing them.