The Astral Blades were a formerly Loyalist Space Marine Chapter of unknown Founding and origin. In 121.M37, they were led down the path to Chaos by their prideful Chapter Master, who had been possessed by the Daemon Etherak the Unrepentant. The Daemon's servants used sorcery to possess almost every battle-brother within the Chapter's subterranean Fortress-Monastery one by one, slaughtering those strong enough to resist.
As the blood of the last of the fallen was still cooling, the possessed Space Marines plundered the Chapter's gene-seed stores and set off for the Eye of Terror. However, when their Battle Barge, Sword of Stars, reached high orbit, the Grey Knights were waiting for them. In the furious battle that ensued, Grey Knights Terminators teleported onto the bridge of the Battle Barge and banish Etherak back into the Warp in the midst of a furious melee.
Broken in body and spirit, the Chapter Master of the Astral Blades accepts the Emperor's mercy delivered at the hands of his "saviours". Nothing else is known about this obscure Chapter in official Imperial records.
The Astral Blades' Chapter colours are not listed in current Imperial records.
The Astral Blades' Chapter badge is not listed in current Imperial records.
- Codex: Grey Knights (7th Edition), pg. 93