Thanatos is a one-of-a-kind off-shoot of the Tyrant Project, derived from research into the T-103 series. The test subject upon exposure to Epsilon, was augmented to develop superhuman strength and agility. In its only known combat against trained military professionals, Thanatos demonstrated a resistance to small arms fire and a considerably-increased running speed, and was capable of killing with blows to the head and impalement with its claw. Thanatos' Super Tyrant mutation increased its height to over 12 feet tall and developed powerful muscles to allow it to jump high into the air.
Thanatos did however demonstrate two weaknesses in its activity. Firstly, it was sensitive to jolts of electricity and could be knocked out. As with other Tyrants, its grafted animal heart was left exposed, though until its Super Tyrant mutation this was covered by a metal casing.