Under exceptional circumstances, a Serpent Priestess may aid dark-hearted creatures, in an effort to lead them to their doom. If a player of a Dark Elves, Skaven, Chaos, Vampire Counts, Tomb Kings, Ores and Goblins or Chaos Dwarfs army wishes to 'hire' a Serpent Priestess, then they may do so, but they provide one for their opponent to use too, with neither side paying the points cost for the model (each still takes up a Rare and a Hero choice).
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