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Warhammer 40K - Heroes of the Heresy - Revuel Arvida

Revuel Arvida was a Sergeant of the 4th Fellowship of the Thousand Sons Space Marine Legion during the latter stages of the Great Crusade and the onset of the Horus Heresy. A member of the Corvidae, he was part of a fleet element of his legion that was dispersed under secret orders by Magnus the Red prior to the Battle of Prospero. Approximately six months later he returned to Prospero under the command of his Fellowship Captain, Menes Kalliston, in an attempt to discover the fate of the other Thousand Sons.

Later during the Horus Heresy Revuel Arvida was transformed in an arcane ritual into Janus, who would go on to become the first Supreme Grand Master of the Grey Knights.

Deep in the Imperial Dungeon, Malcador attempted to bind a fragment of Magnus the Red which had remained on Terra after his ill-fated message damaged the Webway Project, intending to use the resulting 'abomination' to guard the gate, as the Emperor had originally intended Magnus to do. The Khan demanded the Sigillite stop, but arrived too late. When Arvida's mutated body began to be consumed by psychic fire, unable to contain the power of the shard, Malcador went to kill him, but the Khan insisted that the sorcerer was his ward and must be given his chance. Smashing the arcane machinery in the chamber, he freed the amalgam of Magnus and Arvida from the suppression fields and wards.

The energy consuming Arvida's body solidified into matter, taking the form of a space marine without any trace of the flesh-change and one eye swollen with scar tissue. Not the shadow-primarch in a host that Malcador had intended, nor entirely Revuel Arvida, the new title he asked to be called by the name it had always had: Ianius.

Ianius' name would ultimately become better known as Janus, the first Supreme Grand Master of the Grey Knights. He was one of the eight Space Marines whom Malcador the Sigilite took to the moon of Titan towards the end of the Horus Heresy, Janus was appointed as Supreme Grand Master when Malcador returned to Terra shortly before the Battle of Terra and oversaw the Chapter through its first challenges.