Nethu

Nethu, the son of Ereth Khial's, is the gatekeeper of Mirai, the Elven Underworld. It is his task to see that those souls claimed by the Pale Queen remain sealed away until the hour of the Rhana Dhandra -- the last battle of the gods. It is also Nethu's duty to see that no intruder breaches the Mirai to steal away the secrets of the dead -- at least, not without offering a suitable tribute to the Pale Queen.

In this, the Keeper of the Last Door is aided by a host of Dark Pegasi, who watch unblinkingly from the battlements of his dark fortress, easily mistaken for statuary by the unwary. When roused, none are safe, for their shadowy maws consume soul-stuff as easily as mortal flesh.

Source

 * Warhammer Armies: Dark Elves 8th Edition -- pg. 51