The RvneTek units known as Synthesis are lumps of flesh and machinery, from which a humanoid torso protrudes. They have extensive powers of what seems to be psionic nature, as they are the first beings ever to have been implanted with Qi Extraction devices, turning their lifeforce into physical energy. They can project powerful shielding around themselves and fire balls of pure energy from their (crippled-looking) hands by merely pointing the hand at a target. Crawlers are tightly controlled by the Controller and are used as the corporation's ultimate means of defense or attack, but seem pretty useless for anything else. Different types of non-Rvnetek Crawlers exist in the Bunkers, and the RvneTek simply caputed and re-engineered some of these to create their units.