|Map||Basic Data||Planetary Image|
|Affiliation:||Imperium (Dark Angels), formerly Necron|
|Class:||Necron Tomb World|
In M41 it was invaded by a combined force of the Necron Xonthar Dynasty, led by Overlord Varagon Drakvir, and the Death Guard, led by Typhus. The alliance between them was made as each would benefit, with the Dark Angels losing control of Nymidae: for the Xonthar Dynasty they would claim Nymidae as their own, as it was unknowingly to the Imperium a Necron Tomb World, with countless Necron sleeping beneath its surface, while the Death Guard would claim the Dark Angels' secrets, that laid within their Fortress of Redemption. They did not count however, on the tenacity of the Dark Angels defending Nymidae, who were led by Grand Master Azrael, nor did they know that a Blood Angels force, led by Captain Tycho, would come to the Dark Angels aid. Once the Blood Angels made planetfall, the two Chapters fought side by side and though they suffered heavy casualties, they defeated the Necrons and Death Guard's forces and drove them off of Nymidae.