These are the rare sub-class character cards granted by Rod of Seven Parts or Skull of Cavadar. They can only be used once per year by a player who possesses a complete Rod of Seven Parts or Skull of Cavadar token. Players with both of those tokens can play a sub-class character twice per year.
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https://truedungeon.com/resources/item/92-character-class-cards#sigFreeIdb3c3709a7f
https://truedungeon.com/resources/item/92-character-class-cards#sigFreeIdb3c3709a7f