This vile xenos species seems set to cause further trouble in Finial Sector - both for Imperials and Reavers. They lurk in the shadows, waiting to strike when either side is off-guard or exhausted. Then they strike with great fury. The presence of tech-priests and such seem to anger them the most (and they don't care if they are Dark Mechanicum or Adeptus Mechanicus).

The Kull are humanoid in appearance. They are taller and more physically capable than humans - almost like an Astartes, but without the additional organs and implants. Their skin is black - not negroid black, but completely black, like the color of the bio-polymers that make up the marine's carapace graft. Facial features are also human-like, but their features are flat and rugged, and their facial expressions fare from the human norm.

The Kull operates using STC technology - probably because such equipment is better than their own xenos rubbish. Ships, armour, weapons, simple utilities - everything is just as STC as your average Imperial settlement.

Reports of Kull exist as far back as the great Crusade, but at that time they didn't pose a threat to Mankind. War broke out during M35, when the AdMech decided to investigate rumors of the Kull possessing a partial STC. No such thing was found, but several new templates or fragments were added to the AdMech's inventory. The Kull were believed utterly destroyed. Obviously they weren't!

Hard to say if they will become a problem for the 10th.