Malleum

Malleum is the location of Basilica Noctis, fortress and headquarters of the Void Stalkers Warband. The Daemon Prince Baleros resides within the inner sepulcher of Basilica Noctis, sometimes emerging to lead a contingent of Void Stalkers on a raid in Real Space.

History
Malleum was discovered at an unknown point in time by Baleros, Daemon Prince of Chaos Undivided. Baleros lead the Void Stalkers Warband to this world after their near annihilation. The Void Stalkers built several fortresses on Malleum, the greatest of which is Basilica Noctis. Malleum is also home to a chaos cult called the "Disciples of Malleum". The Disciples of Malleum populate most of the fortresses on the planet, while Void Stalkers chaos marines reside within Basilica Noctis.

Geography
Malleum is a volcanic planet who's geography has been warped and exaggerated by the power of the Daemon Prince Baleros. Between the jagged mountains, volcanoes, and rivers of lava are several great fortresses and towering spires inhabited by chaos cultists. The greatest fortress is inhabited by Heretic Astartes.