Loken, along with his friends Torgaddon and Nero Vipus, are selected to liberate the world of Istvaan III, which had turned traitor. Loken's final active appearance is in Galaxy in Flames although he briefly appears in Flight of the Eisenstein with Torgaddon. In the events of Horus Rising, he joins the Mournival, Horus' select group of his closest advisers, but sometime during False Gods, the Mournival as good as disbanded. He was captain of the tenth company of the Luna Wolves Space Marines, who later became known as the sons of Horus. Garviel Loken is the primary protagonist for much of the Horus Heresy series. However, after Horus was wounded on Davin, First Chaplain Erebus of the Word Bearers took part in an illusion, disguised as Sejanus, but his disguise is blown when the then-loyal Magnus the Red intervened to try and keep his loyalty to the Emperor. Sejanus died before the events on Davin and therefore died loyal to the Emperor.

Horus Rising says Sejanus was 'the all-rounder captain' and that Horus had loved Sejanus like a son. Before the events of Horus Rising, Sejanus is sent as an ambassador to greet a world which has not yet reached compliance, and is brutally murdered. Hastur Sejanus was Captain of the Fourth Company of Luna Wolves, and member of the Mournival. For more information, read List of Chaos Space Marines.'

'This list does not include Abaddon the Despoiler. For more information on those characters, read List of Chaos Space Marines.' 'This list does not include Abaddon the Despoiler, Lucius the Eternal, Fabius Bile, or Kharn the Betrayer.

This is a list of characters from the Horus Heresy book series published by Black Library.

Horus heresy novels when finished