Changes

The Cythors have spindly limbs and vile faces, elongated and inhuman. They live in the fortresses with sheer walls of glimmering crystal and used some uncanny weapons.{{Fn|2}} According to the [[Death Spectres]], the Cythors are not alive in the sense humans would understand it.{{Fn|5}} Cythor Fiends use small silver discs that when activated causes them to shatter apart and reform into deadly crystals that quickly slash the throats of their victims. These mobile crystals can become quite small, and seemingly possess the essence of the Fiend.{{Fn|3}} In addition, the Cythors employ unique warships, with one known class being the [[Pinion Class Stealth Frigate]].{{Fn|4}} When they still lived in the Ghoul Stars, the Cythor Fiends' realm was centered on a [[Gas Giant]], dubbed "9836-18 Gave Core" by the Imperium.{{Fn|5}}

Cythor Fiends were seen as vicious creatures by the [[Imperium]], and every probe or scout team sent into their territory never returned.{{Fn|1}} They often clashed with the [[Death Spectres]] which were tasked with watching over the Ghoul Stars.{{Fn|4}}{{Fn|5}} At one point, the Death Spectres launched a major campaign to destroy the Cythors, only to find their worlds empty. As a result, the Chapter became aware of the fact that the Cythors possessed technologies with which they could ultimately evade any attempt to exterminate them. Eventually, the Cythors returned to their old planets and reclaimed them. From then on, however, the Death Spectres always limited themselves to containment tactics.{{Fn|5}}

In late [[M41]], the race was largely exterminated by the [[Black Templars]]{{Fn|1}} and Death Spectres{{Fn|4}}{{Fn|5}} in the [[Ghoul Stars Crusade]], with only their homeworld homeworlds{{Fn|4}} remaining outside Imperial hands. However, when the Black Templars arrived at their homeworldhomeworlds, they found it them completely empty and vacant of any Cythor presence. What exactly happened to the race initially remained a mystery.{{Fn|1}}