Editing Rachnus Rageous (section)

==[[Horus Heresy]]==

[[Horus]] was aware of the Desert Fangs' service record against Chaos, and perceived that they might be a threat to his rebellion, especially as nearly the entire Legion was part of the force attacking Isstvan V.  To divert them, he used his position as Warmaster to influence [[Tialoc Ekans]], Primarch of the [[Sky Serpents]], to attack the Desert Fangs' homeworld.  [[Alpharius]] warned Rachnus that his homeworld was in danger, and so the Desert Fangs fled to [[Voralia]].  Unfortunately, they were too late to stop the Sky Serpents' fleet; with the Sky Serpents between them and their homeworld, the Desert Fangs fled back to the Isstvan system, hoping to draw the Sky Serpents away from Voralia, but their gambit failed (though this did give the Desert Fangs some time to retrieve the remnants of the loyal legions).  When the Sky Serpents did engage the Desert Fangs, the latter were so enraged over the loss of their homeworld that the Sky Serpents were all but annihilated.  Fal was mortally wounded in the attack, but his [[rage]] was so strong that he lived long enough to be entombed in a [[Dreadnought]]; in fact, such was his [[rage]] that he would later be recognized as the first [[Belligerent Engine]].

Rachnus was contacted by Alpharius while his Legion regrouped from Tialoc's attack; Alpharius briefly explained that the [[Chaos Gods]] were very real, that Horus had been corrupted by them, and that the Alpha Legion was hoping to destroy them from within.  He urged Rachnus to go to [[Terra]] as quickly as possible.

After licking their wounds and regrouping, the Desert Fangs (and assorted rescued loyalists) raced to Terra, arriving on what would be the final day of the siege.  Rachnus, a redemption-seeking Tialoc, and a force of Silencers entered the Vengeful Spirit in a stealth ship (aided by their null-auras), and managed to fight their way to the bridge.  Rachnus was too late to stop Horus from mortally wounding the [[God-Emperor of Mankind|Emperor]], but he plowed through Horus's bodyguards and engaged him at close quarters, disrupting Horus's control over his powers enough for the Emperor to return the favor.