Yaelis

Yaelis is a hive world of the Thramas Sector on the Eastern Fringe. During the Thramas Crusade of the Horus Heresy it was taken by the Night Lords when Konrad Curze descended in person to overwhelm the urban defences of its hives, recovered by the Dark Angels under Lion El’Jonson after two months of fighting against Night Lords delaying actions and slave armies, and later retaken by the Night Lords as both sides neared exhaustion. Its later history is not securely recorded.