View source for Astral Claws History

In contrast with more zealous members of the Codex Astartes, the Astral Claws chapter has always prided itself on discipline over devotion.  Lugft Huron, the Chapter Master, earned himself no friends among the Administratum when he declared that the Emperor was nothing more than a man reduced to a machine, who cared not whether his people lived or died.

The Ecclesiarch, ever the jealous bureaucrat, despises Space Marines - they are out of his jurisdiction.  Nevertheless, here was a member of the most powerful fighting force extant nakedly expressing hostility.  He immediately mustered what support he could, speaking ill into the ears of the stout, fanatical Master of the Imperial Fists, Vladimir Pugh, who moved his allies to attack the 'renegade'.

The battle took place on the planet Badab, where the Astral Claws had their home.  They would have been decimated by the Imperial Fists blitz had not the master of the Mantis Warriors, another chapter recruited for this duty, warned them out of honor.

Fully half the Chapter stayed to buy their comrades time to leave; those who fled took their fastest ships into the heart of the Maelstrom with orders to do naught but survive.

The attackers pursued, but only the fanatical Imperial Fists contingent was foolish enough to follow the fleeing Astral Claws into the Maelstrom.