Ghenna

Ghenna was a Great Crusade-era world; no segmentum, system, or coordinates are recorded for it. It had accepted Imperial compliance, after which contact with it ceased, and the World Eaters under the primarch Angron were sent to reassert control.

The Ghenna Massacre was fought there in the 30th millennium, with no narrower year recorded. Ghenna’s inhabitants had altered their own bodies and made use of synthetic simulacra in the fighting.