Wel'Kor'cha

History of the Wel'Kor'Cha
They are a Xenos race confined to 3 worlds in the Fidea system and mortal enemies of the Fidea Imperial Guard http://warhammer40kfanon.wikia.com/wiki/44th_Fidea as such most of the information the Imperium has on this race came after the death of the commander for whom the species is named in 823.(the name by which they call themselves is unprouncable) Once confined to the frozen world of Fidea Secundus they began a nascent space program sometime in M31 to escape only to discover that the worlds of Fidea III and IV were just as uninhabitable. Undeterred and reasoning that since they had survived one frozen world they could adapt to the others easily, they built cities underground to escape the cold. These cities would go unnoticed for 10,000 years as the people of Fidea Prime were trying to survive an ice age. Among the rulers of the species, still living on Fidea Secundus these other settlements would become known as the "Lost Colonies" and would remain so until contact was reestablished with them almost 8000 years later.

M39
They could hardly fail to notice when an Imperial Warship entered the Fidea system. However they thought nothing of it, they once had spacecraft but had written them off as a bad idea when the Lost Colonies were lost. This warship, only arriving in the system due to an act of sabotage by 500 crewmen who had turned to Chaos to cope with their cruel commander, would go on to discover Fidea Prime and bring the people of Fidea into the Imperial fold, all unknown to the Wel'Kor'Cha. Teodora Mafetti captain of the Battlefleet Medici cruiser Leonara Superba exiled the 500 to the surface of Fidea Secundus believing that the weather would kill them quickly. He was wrong. Wel'Kor'Cha hunting parties brought the 500 before the ruler and his court. It was here that the hatred between human and Wel'Kor'cha began. These renegades regaled the monarch with a distorted version of the Horus Heresy and all of the Imperial cruelties that followed, however they failed to mention just how large the Imperium truly was, these ideas also failed to translate as the Psykers had never before a human mind and were unused to the experience. The monarch, the higher nobility and the warrior class turned to Chaos undivided shortly thereafter blending it with their own religious traditions. Spurred on by the word of Khorne, the ruler and his warriors went on a decades long campaign and crushed the "Freeholds"-led by warlords who denied his authority, uniting their world under the 8 pointed star of Chaos. The 500 would die in the intervening decades, providing knowledge and technology and they would come to be regarded as holy figures, prophets of a sort.

M40
The Wel'Kor'Cha would not be a united people until late in M40 when the current rulers, having recently relearned spaceflight, improved by the knowledge brought by The 500 finally reestablished contact with the "Lost Colonies" all while the Imperium took no notice. Millenia 41 saw them finally take notice of Fidea Prime. Recognizing it as an Imperial World the united armies- led by the Supreme Commander Wel'Kor' Cha invaded Fidea Prime in 790. Their grievous errors in strength and numbers saw them driven back and led to decades of war sometimes gaining great victories, and sometimes terrible losses, They eventually lost in 823, Wel'Kor'cha died in battle and they were reduced to remnant populations actively hunted by the Fidea Imperial Guard.

Psykers
Psykers are rare and revered. They are seen as being blessed by the Chaos Gods and are highly respected as councilors and teachers. Most served the government but a few acted independently in industry and academia- the increase in mental power also provides a massive boost in intelligence and reasoning. Due to their rarity when they are discovered they are instantly regarded as nobles whatever their class of birth.

Military
They were once led by Wel'Kor'Cha, while the Fidea called him a Warchief his title translated more closely as "He who leads all warriors" - something close to an Imperial Lord General. beyond that organization seemed similar to an Imperial Guard army, with subordinate generals and lesser officers. Their weapons were based on Imperial designs brought to them by the 500 but they also favored their own designs, autorifles and various blades- bladed weapons were seen as being true weapons of Chaos, while other weapons were simply useful tools. Their worship of Khorne led them to reckless action time and again and eventually saw them defeated. Their navy consisted mostly of lightly armed transport ships designed to carry armies over short distances and were never built to face Imperial anti-aircraft weapons.