Warhammer 40K

"The Daemon has many forms. You must know them all. You must tell the Daemon from his disguise and root him out from the hidden places. Trust no-one. trust not even yourself. It is better to die in vain than to live an abomination.
The zealous martyr is praised for his valour: the craven and the unready are justly abhorred."

Commission, a Guilliman's Executioner Victrix Guard.