Sepulchrex

The ushabti guard of Nagash's inner sanctum, the Sepulchrex responded only to Nagash's will - even Arkhan the Black, trusted though he was, had no control over their actions. Many of the Nehekharan kings thought it strange that Nagash would surround himself with the graven images of the gods he had cast down, but Mannfred von Carstein - himself no stranger to hubris - had grasped the truth of the matter. The Sepulchrex bore the gods' likenesses precisely because Nagash had defeated them - they were reminders of a cherished victory, their voiceless servitude one of the Great Necromancer's few remaining conceits.

Source
Sepulchrex
 * The End Times Vol V: Archaon
 * pg. 81

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