Lords of Oblivion

The dragon riders who fought for Malekith at the Blighted Isle were not Caledorian, but rather high ranking officers of the Black Guard who were granted their steeds as rewards for loyalty. These reavers hunted as a dark-winged pack, overwhelming their enemies one foe at a time - a methodology which invariably meant that every Lord of Oblivion had at least a partial claim on every kill. This, in turn, led to bloody rivalries in the battle's wake, as each dragon rider sought to claim for himself the rewards in reality earned by all.

Source
Señores del Olvido
 * The End Times Vol III: Khaine
 * pg. 61

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