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Prior to the Gothic War, Chaos forces raided the planet in search of the Eye of Night artifact which was embedded in an ancient statue worshiped as a god by the Ratlings in pre-Imperial times. At first the Chaos forces were driven back by the presence of a nearby Imperial Guard recruiting force. Returning a month later however the Chaos ships blockaded Ornsworld and launched a full scale invasion. Millions of Ratlings were slaughtered. Amongst the carnage the Chaos forces successfully escaped with the Eye of Night artifact.
In 6990999.M41 in a cruel repetition of the horror of the Gothic War, Ornsworld came under attack from the Knights of Blood Chaos Space Marines. Over ninety percent of the planet's population was massacred before Imperial Guard reinforcements arrived.
During an invasion of Ornsworld by Abaddon (whether this was one of the above mentioned attacks is unclear), Haupstemmler Keep was the last bastion of defence for the Ratlings. Chaos Sorcerers were brought in to breach the keep's walls and adamantium-clad gates with a penetrative vortex spell. However, certain key words of the spell were mispronounced and it spiraled out of control. Detonating catastrophically and engulfing the Chaos army, it turned three thousand of their own warriors into Chaos Spawn. Part of the north wall was also leveled in the magical mayhem, and the new horde of mutating flesh fell upon the defenders, soon overwhelming and taking the keep. Even now, hundreds of years after Abaddon left the world, rogue spawn need to be hunted and killed in summer beast hunts.
- 1: Battlefleet Gothic Rulebook, pg. 93
- 2: Codex: Imperial Guard (5th Edition), pg. 25
- 3: Apocalypse, pg. 174