I got an email today with a cool picture of my count as Demons for Imperial Guard all together look rather stunning.
Before I get onto some fluff etc, here are some more pictures:
During battle, a psyker, with great effort can open up a portal gate between the ship and the battlefield. These armed and potentially deadly mutants then find themselves in the thick of the enemy fighting to the death.
The mutants are kept in line through the use of a mysterious goo. Huge slug like beasts produce a lot of this goo on a few particular agri worlds and is harvested in great haste due to its potential. This goo has lobotomizing effects on the mutants who sit in these ships armed and lazy, their weapons rusting away and their motivation dimmed. Then when brought out of this goo they kick into their senses at an aggressive rate as they find themselves unleashing anger into their new enemies.
The Mutants never survive a battle as the cost to ship these lost souls back to their holding ships is too high they are simply killed and replaced.
Of course this information is classified but rumors spread of such beings as they are inevitably seen on the battlefield. Psyers who summon them are watched with an exceptionally close eye and have less tolerance by their superiors. Opening these gates is not only a powerful tool for these psykers to control it is also potentially deadly for all those nearby. "
Thats all I have so far. It means I can use the summoning rules without being full on heretical about it. I think they look amnazing so thanks Oliver from Equinox Painting!