Kyren

Kyren was a daemon world of Tzeentch in the Maelstrom, made entirely of crystal and formerly a feral world, whose mutated tribes fought endlessly over the Ebon Talon, a relic resting in a cave within one of its mountains. When the Red Corsairs under Huron Blackheart and his lieutenant Verngar came for the relic in early M42, Verngar took it, and the world, whose existence depended on the Talon, came apart and exploded. It is now recorded as a dead world without population.