Chemos

Chemos was the homeworld of the Primarch Fulgrim of the Space Marine Legion of the Emperor's Children and by all accounts not somewhere you would want to live.

An industrial world, before the age of strife Chemos had traded it's mineral resources for food from other worlds. However when the age of strife began Chemos got cut off from the rest of the galaxy at large and was forced to try and fend for itself. It was a losing battle, as they couldn't produce enough food resources, water and the like to survive and the population was in a slow decline to extinction. In desperation all non-essential industry such as art, music and anything remotely creative was abandoned and everyone was focused on trying to get as much substance out of the barren planet as possible.

Grimdark enough for you then?

Seriously though why won't the Chemians think to construct bio-domes and the like on their planet to feed themselves while they had the chance during the golden years? You'd think common sense would tell you secure yourself first and then think of working on a wealthy trade system? They were trading for food well why not then for plants, stock animals and the like? But then that won't be grimdark enough so I should just stop thinking common sense. Anyway.

The decline all changed when Fulgrim speared down from the sky and smashed into the planet. Against the wishes of the ruling bodies of the planet the leader of the expedition to the crashed status pod decided to adopt the young primarch as his own son and named him Fulgrim. Soon the Primarch grew at a great rate and did more then his share of work in the industry of the planet. He rose to become a leader of the industry and then one of the rulers on the planet. Deciding to fight back against the decay he saw he encouraged his fellows to brave reopening long lost mines and outposts to increase the productivity of the factories. Soon under Fulgrim's guidance, the planet was producing more resources then it needed and art and music began to flourish again as they were reintroduced to society. Chemos began a beacon of productivity and civilization and when the Emperor arrived Fulgrim was all ready to join him on his merry crusade.

Not to put a damper on things or Fulgrim's accomplishments but it seems odd no one else on Chemos even though to carry out the idea to expand their industry. It's hard to believe that unless everyone on the planet was a few screw short of a lasgun.

During the great crusade there wasn't much word of what happened on Chemos besides regular influxes of recruits for the Emperor's Children came from the world. Considering it was a world of culture, music and relaxation now, it could be this had an effect on the recruits and left them more open to the corruption of Slaanesh, because at the time spiritual discipline wasn't something the Legions tested for.

After the heresy what with Fulgrim hooking up with Slaanesh and the Emperor's Children deciding to form their own ghasty version of a punk metal band, Chemos was bombed to dust by the Imperium on fear the corruption of the primarch had come from there, despite no evidence presented this was the case. As with the tratiors homeworlds in general, it was a case of shoot first ask questions later.

Since then Chemos's location and it's history has been hidden by the Imperium and it's current status if any is unknown (won't it be the greatest irony if it was now a sisters of battle retirement homeworld? lol).