The Black Templars are a loyalist second founding Space Marine Chapter derived from the Imperial Fists'gene-seed and their primarch. Rogal Dorn. Their origin can be traced back to the Imperial Fists' defence of Terra durning the Horus Heresy.:
Since that time, the Black Templars have been on the longest Imperial Crusade the Imperium of Man has ever known to prove their loyality to to the Emporer of Mankind.
“For the Emperor!.”
The relic earned its name, after the Black Templar Balthus used it to banish the Daemon Prince Angorakh , even as he was being killed. Though Angorakh's acidic ichor still marks the Fist's metal, it strikes have been left undiminished