Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by having 5 or more DARK monsters in your Graveyard while you control no monsters. Once per turn: You can banish 1 DARK monster from your Graveyard to target 1 DARK monster in your Graveyard; Special Summon that target.
Allure of Darkness
Draw 2 cards, then banish 1 DARK monster from your hand, or, if you do not have any in your hand, send your entire hand to the GY.