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As a simple Battle-Brother, Draigo banished the Daemon Prince M'kar the Reborn.
In 901.M41, Draigo would become Supreme Grand Master of the Grey Knights after the Daemon Prince Mortarion killed his predecessor, Geronitan. The act made Draigo fly into a rage, who assaulted the Daemon Primarch and carved his forebear's name into the fallen Primarch's heart - an insult Mortarion has never forgotten.
However, since a second confrontation with M'kar, Draigo has been cursed to a life trapped within the Warp, doomed to walk within the Realm of Chaos itself. To remain pure when constantly assailed by Chaos shows fortitude and personal strength that is beyond measure. He has undertaken many great exploits within the Warp: slaying the great Bloodthirster Kar'Voth, setting fire to the jungles of Nurgle's domain, defeating the six chosen Daemonettes of Slaanesh, the Six Sisters, and destroying the fortress of the Lord of Change M'Kachan. But while Draigo lives, he will prevail and one day, he will return.
Info taken from Lexicanum.