Ash Over Mobidium

Ash Over Mobidium was the name of a conflict that occurred on the long-dead ocean world of Mobidium between the Penumbral Hydras Renegade Space Marine Chapter and the Ashen Exiles Chaos Warband, which occurred at the dawning of the 42 nd Millennium.

Background
It was at the turn of the Millennium that the vile Ashen Disciples warband of Chaos Space Marines arrived in orbit of the long-dead world of Mobidium. Entering the long-believed dead system, the Tzeentch worshiping warband made their way to the cradle of the Novus Krakens, Leviathans Eclipse, and Penumbral Hydras seeking an artifact of great power. The divinations of the warband told them that a battle of great proportion would take place upon the world over the artifact they sought, and were prepared for conflict.

Among their number were a larger handful of Acolyte warbands manipulated to do their bidding, a nearly regiment-sized force of the Ashen Disciples' own cultists; the Thrallband involved consisting of, 9 Lesser Sorcerers, 36 Rubricae, 45 Scarab Occult Terminators, 27 Tzaangors, and prepared to summon unknowable numbers of daemons of the Changer of Ways, all commanded by Arch Magister Ankhu Takar whose second was Phol T'Kor.

When the devout of Tzeentch deployed teams onto the surface, on two fronts were the traps sprung. In orbit the fleet was ambushed by the Penumbral Hydra's ships, who were camouflaged in the asteroid fields that acted as rings from the destroyed moons. On the ground, sudden bombardment from Whirlwind rocket artillery blasted several positions.