The Series starts out with Sven trapped in a cage in a remote fort in the middle of nowhere waiting to be lashed to death as punishment for assaulting an officer.
Several months later the Ferox are attacked by an elite human military force that is under the control of the empire of OctoV called Death's Head.
There he is recruited and learns that he's special due to the fact that he is not entirely human, which explains his remarkable healing abilities and fighting prowess.
Sven goes through several tests, including surviving a stint on a frozen prison planet, and successfully assassinating a senator.
After being fully admitted into Death's Head, Sven then goes on to fight the Uplifted, sworn enemies of OctoV's empire.