Keep the Heroes Out!
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Where do the three Gnolls appear when you discard a coin to summon them, and does the card need a Gnoll on the board?
They appear only in the room where the coin-spending Gnoll stands, because the summon is a surge tied to that room. The card needs one of your Monsters on the board, since actions that use a card's ability need a Monster in the dungeon, except ambushes and the Cells.