Infinite Singularity

The Infinite Singularity is a Blackstone Fortress, ancient fortresses built by the mysterious reptillian race, the Old Ones. It serves as the moble Fortress-Monastery of the mysterious Zero Legion chapter. Massive, armed and warp-capable, this edifice bristles with great power, befitting of its role and is fully capable of fighting off a fleet of attackers if need be. The deepest parts of the Blackstone Fortress holds technological wonders only witnessed by the Astartes, Tech Priests and occasionaly Inquisitors.

History
There is very little information on the Infinite Singularity, mainly where and when it was discovered by the Zero Legion. Its first official appearance was during the Age of Apostasy, when it drove away the fleet of the Dark Core warband. Since then, the Blackstone Fortress has rarely been used, only during the most serious of engagements.

Recently it was besieged by a gathering of various Chaos Warbands manipulated by the Dark Core during the 13th Black Crusade. The Fortress suffered severe damage and while the enemy was eventually pushed back, the Infinite Singularity was unable to move for the rest of the Indomitus Crusade until eventually being repaired.