Arc 13Horus Returns
Yvraine sought Gamma World's help against Valde and the awakening Necrons, while Gamma World pursued the Webway Key and Vashtorr. After restoring Horus, Gamma World sent him to fight Chaos, and his return divided the Black Legion and alarmed the Imperium.
- Yvraine brought the Ynnari to Gamma World, warned Cisrain of the Necrons, and offered a Webway Key fragment in exchange for help retrieving a relic from Commorragh.
- Gamma World and the Ynnari attacked Commorragh, where Slaanesh daemons, Harlequins, and rival Dark Eldar factions turned the struggle into a citywide battle.
- Vashtorr learned that Gamma World held the final key fragment, while Szarekh investigated Gamma World's soul-restoration technology and saw a Necrontyr revived through the Megastructure Synapse Condensers.
- Cisrain and Szarekh secretly agreed to target Vashtorr, and Cisrain ordered Horus resurrected to lead Gamma World's campaign against him.
- Gamma World's researchers restored Horus, bound his soul to the Emperor, and equipped him with the Emperor's Sword before sending him to seize Wyrmwood and confront Vashtorr.
- Horus fought Chaos forces on Cadivan, destroyed their Daemon Engine, and rallied Black Legion followers as he vowed to rebuild his Legion and reclaim the Imperium.
- Abaddon learned that Horus had returned and prepared forces to kill him, while Vashtorr moved to take control of the Arks of Omen.
- Horus advanced toward Kadiwen with Angron and the Expeditionary Force as Astropaths spread news of his return through the Imperium.