Battle of Ballios
On the Cemetery World of Ballios, a squad of Salamanders interrupts a Chaos Space Marine warband as they seek to debase a holy mausoleum by performing the Rite of the Reshaper amongst its ranks of grim tombs. Though they kill the Sorcerer before he slaughters one of their battle-brothers – the final sacrifice – a gaping hole to the Immaterium is opened. Numerous Daemons crawl into the mortal realm and tear into the Space Marines, enraged at being denied their prize. It took the full fire and might of the 4th Company to rid the world of the misshapen horrors.