Krull, Xumuc Occultist is a Hero unit card.
This card can also be obtained from Empire of Glass Card Packs. Diamond Chests and Empire of Glass Card Packs can give Premium versions of this card.
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||Now "SS: When Krull damages a player, play a unit from their void with cost less than or equal to the damage dealt" (previously no influence requirement).
||Released in Empire of Glass.