As with all sets since Realm of the Ice Witch, the legendary set includes a card with special rules. These rules alter the base environment of the game to give the set its own special flavor. These special rules are, of course, optional, but I think you will enjoy trying them out.
Nakari, the Queen of Darkness and Goddess of Serpents likes fiends. Well, really she loves fiends. Those who worship her too much may just find themselves...changing. The Wrath of the Serpent Goddess allows fiends to become cheaper and cheaper to play (their Peril cost is reduced) as the game advances. In addition her most faithful followers, her priestesses become more deadly.
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When the Lair of Nakari is placed it triggers a special event. The Legendary Quest: Defeat Nakari becomes active as a global Quest (anyone can attempt it). And Nakari appears in her lair.
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And revealed at last, the Queen of Darkness herself, the Serpent goddess!
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Enjoy.