Hammer of Daemons

Hammer of Daemons - Ben Counter Justicar Alaric finds himself cut off from the rest of the Grey Knights when he is captured by Chaso forces.
Forced to fight his way through a planet which is nothing more than a massive arena for Khorne the blood god, he has to rely on his ingenuity to survive.

Lots of good moments but the ending did show how far removed from humanity he has become by being a Space Marine.