Vasellisk
Vasellisk the Shrouded was a Night Lords Sorcerer Warlord, who led his Warband to invade the Imperium Mining World Xanthematos, after being drawn there by an endless psychic scream. The Warband then proceded to butcher the world's entire population, but where then sealed within one of its mines by the Thousand Sons Magister Hasophet and his Mind-Eaters thrallband. It had been Hasophet who had lured Vasellisk to the Mining World, as the Sorcerer Lord was needed for the Magister's plans to attain Daemonhood. Hasophet then proceeded to fill the mines with Warpfire, whichs burns Vasellisk's Warband to ash, but turned the Sorcerer Lord's body into a lump of dark glass pulsing with physic energy. The Magister later collected the dark glass, which he named the Shrouded Crystal, and became one step closer to becoming a Daemon Prince.[1]
Source
- 1: Codex: Thousand Sons (8th Edition), pg. 29 - Annals of the Arcane: Crystallised Night