“Additional relics were found in the tomb alongside the
Doom Marine. Some incantation tablets, and an ancient combat suit which was given a name: the 'Praetor Suit'. When found, it was encased in an inscribed stone tomb. The suit was extracted from the rock, cleaned, and subjected to numerous tolerance tests, and found to be almost impervious to any damage. It appeared to have some mechanical function as well - small receptors on the gloves and chest plate that attracted Argent plasma and dissipated it through capillary tubes in the substructure. Markings on the armor were also consistent with images of a man (or humanoid) seen in several tablets and stones found on other expeditions. The same markings were also noted on the Helix Stone.
Despite it being clear that the suit can be activated in some way, no method has been found to do it. It appears to be missing a component, likely the Doom Marine himself.”