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The Arches of Aoskar, Room Seventeen. The room is laid out like a checker board, with each black square filled with a matching iron bound chest. A scroll nailed to the door reads: "Of course, most of these are mimics, but one contains a deck of many things."

The DM should select a chest at random to contain the deck. Whenever a player opens a chest, roll a d20. If the result is even it becomes a mimic, if odd it dissolves into a 5ft pool of acid. - Dungeonary: One room a day for a month