Editing Desert Fangs (section)

===Gene-seed===

''"My son... The Imperium will need you in the years ahead. Go forth, and engage in whatever cause seems the correct one to you. As far as anyone beyond this room knows, you died to help kill Horus. Pick someone to lead your Legion, take your Silencers, and go forth."'' - [[God-Emperor of Mankind]]

Rachnus Rageous was one of the most powerful Nulls in the galaxy, and his anti-psychic nature imprinted itself on his Legion's [[gene-seed]]. This mutations enhanced the abilities of Nulls to the point that they could manipulate the shape and strength of their “null aura” to some degree, which meant that while enemy psykers' abilities were severely blunted, if not outright deadened, but being in the presence of the Desert Fangs did not mean that allied psykers lost any of their powers, and all Desert Fangs received some measure of mental Warp-resilience. Enhanced Nulls served the Legion's Librarius as "Silencers," and they proved devastatingly effective against daemons and Chaos-held worlds during the Great Crusade (especially when they cooperated with the devious Alpha Legion), and were instrumental in the final attack on the Vengeful Spirit.

The Emperor realized that the Desert Fangs were the Imperium's most powerful weapon against Chaos (with the possible exception of the Grey Knights), but if the Gods of Chaos became aware of a Space Marine Legion whose gene-seed gave them resistance to Warp powers, they would bend every resource to destroying such a threat. Because of their nature, daemons cannot detect Silencers, but mortals can, and the Horus Heresy had proved that servants of Chaos had infiltrated every level of the Imperium. Thus, to preserve the Desert Fangs' secret, he ordered all records of the Desert Fangs' gene-seed and deeds destroyed. Rachnus himself handed his Legion over to his childhood friend Fal, who became the first Chapter Master of the Angry Marines, and set off into the Eye of Terror with all of his Legion's surviving Silencers, while the Desert Fangs' tech-priests modified their gene-seed stocks so that the warp-nullifying effect was no longer active, effectively returning their gene-seed to baseline functionality. Finally, the Legion changed its colors from those of Rachnus's clan to Fal's, and they renamed themselves the Angry Marines, channeling their rage over the destruction of their homeworld and resentment over the loss of their Primarch and history into combat – indeed, so strong is their fury that it shields them from Chaos' whispers as well as their gene-seed ever did.

Unfortunately, the erasure of records was not entirely complete, and in M36, Magos Biologis Jakobus Hamundr pieced enough together to learn of the secrets within the gene-seed. Hoping to create a chapter with the same Warp-resistance of the old Desert Fangs and a more stable collective personality, he instigated the Founding of the [[Knights Inductor]], later known as "[[Reasonable Marines]]," and he succeeded. The Angry Marines were alarmed at this turn of events, because if the nature of the Knights Inductor becomes known to the Gods of Chaos, then all of the Angry Marines' sacrifices will be for nothing. Inquisitor Lord Avius Damnos was able to exploit this concern, in combination with the Angry Marines' vehement disagreement with the Knights over combat doctrine, to convince them to join his crusade against the Aprior Sector.