Idharae

Idharae is a ruined craftworld, not a living one. It helped Malan'tai and Iyanden break Hive Fleet Naga in 812.M41, then walked away when Iyanden ignored Farseer Taolis Eversong's warning that Naga was only a scout. Forty years later the Invaders Chapter, with Legion of the Damned support, smashed the world-ship into a hulk, and Alaitoc answered by destroying the Invaders' homeworld. Tyranids wounded its history; Space Marines killed the craftworld.