Tarik Torgaddon was the Captain of the Luna Wolves and later Sons of Horus Space Marine Legion's 2nd Company and a Loyalist hero of the Battle of Istvaan III who refused to turn to Chaos and betray the Emperor of Mankind alongside the majority of his Legion. Torgaddon paid the ultimate price for his loyalty and was slain by his once close friend and fellow Son of Horus, Captain Horus Aximand. Tarik Torgaddon was one of the four members of the Legion's Mournival, the fellowship of Astartes officers who served as the primary advisers to the Legion's Primarch, the Warmaster Horus. He was known for the possession of an impish sense of humour highly unusual for the usually grim Astartes and for playing practical jokes upon his fellow Luna Wolves.
Torgaddon was a member of the secret warrior lodge that existed within the ranks of the Luna Wolves. This lodge had been created after their conquest of the Feral World of Davin early in the Great Crusade in imitation of Davinite warrior lodges. However, he objected to the decision by the Legion to place Horus, after his wounding on the moon of Davin by the Chaotic relic blade known as the Kinebrach Anathame during his battle with the Nurgleite Eugen Temba, in the care of the Chaos Sorcerers of the Temple of the Serpent Lodge. This objection, in which he was joined by his Mournival brother Captain Garviel Loken, split the Mournival and increasingly the Legion. It also brought Torgaddon the disfavour of First Chaplain Erebus of the Word Bearers Legion. Erebus had replaced the Mournival as Horus' closest adviser after he was "healed" by the priests of the Serpent Lodge and was corrupted by Chaos.
Like Loken, Torgaddon refused to follow his brothers into the service of the Ruinous Powers, particularly as the XVIth Legion's warrior lodge became the primary conduit by which Chaotic corruption was spread through the Luna Wolves. He became even more uneasy after the Luna Wolves were renamed the Sons of Horus by the Warmaster following his resurrection on Davin as a memorial to his ambition and pride. Torgaddon soon became distrusted by Horus and his other Mournival brothers First Captain Ezekyle Abaddon and Captain Horus "Little Horus" Aximand, who in their absolute loyalty to Horus were willing to serve his interests over those of the Emperor.
Because of this distrust, Torgaddon was sent alongside Loken to capture the world of Istvaan III from Slaaneshi rebels located in the capital of Choral City. After Horus unleashed a virus bombing upon the planet in the hope of eliminating the Traitor Legions' remaining Loyalists before beginning their rebellion against the Emperor, Torgaddon was one of the survivors and led his fellow Loyalist Luna Wolves alongside Garviel Loken in the grim battle with the Traitor Legions that unfolded in the blasted ruins of the Choral City for several months after the virus bombing. On the last day of the long Battle of Istvaan III, Torgaddon and Loken received word that their former Mournival brothers Abaddon and Aximand would be present on the planet's surface to oversee the final offensive against the Loyalists that would end in a planetary bombardment from orbit by the Warmaster's fleet. In the hope that they could kill the betrayers and so badly damage Horus' plans to revolt against the Emperor, they ambushed the pair at their landing site, but Abaddon and Aximand proved the stronger. Torgaddon was grudgingly slain in single combat by Little Horus, while Loken was badly beaten by Abaddon and then buried in broken masonry as the massive orbital bombardment of Istvaan III began and killed the last remaining Loyalists on the blasted world's surface.
Torgaddon's gene-seed was later harvested by the Sons of Horus after his death and used by the Word Bearer Chaplain Erebus, along with gene-seed from the Salamanders, Raven Guard, Iron Hands and the Traitor Legions taken at the Drop Site Massacre in a Chaos ritual intended to summon Warp entities on Calth in 007.M31 during the Word Bearers' assault against the Ultramarines Legion. "Tarik reborn, he-who-is-now-Tormageddon" was named amongst those summoned, alongside known daemons such as N'kari, Epidemius and Samus. Erebus also used a fragment of the actual body of Torgaddon to summon into realspace the daemon that named itself Tormageddon. But a side-effect of the ritual was that it also allowed a portion of Torgaddon's own soul in the Warp to regain some sentience and remain free of the Chaos taint. Torgaddon's consciousness would communicate with his old friend Garviel Loken while he was on Luna becoming a Knight-Errant.