Sleepers

 Sleepers , aka Grendels are nightmares of flesh and blood, and of spiked silicon armor that was somehow a part of them. Located in the Tomb of the Sleepers on planet Grendel. The first time the tomb was opened, the monsters spilled out and killed everyone. The planet was burnt from orbit and blockaded.

Later, Shub sent Ghost Warriors to somehow capture the Sleepers, leaving one behind as a nasty surprise. It was captured in an experimental mobile stasis field by V. Stelmach.