Mimic
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Attention: Spoilers!!!
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Mimic is a recurring optional mini-boss, first encountered in the Polychrome Cavern. It is a monster that looks just like a treasure chest, only attacking when the party tries to open it. It is also flammable and weak to fire. When defeated, it will drop the Lucky Coin charm, which gives the party double the gold from defeating enemies when equipped.
Another one can be encountered in the Flurry Mountains, during the team work exercise appointed to the party by Zinnia. This time, however, it will notice the tension between the characters and leave them alone.
A last one can be found in the Uncanny Valley, blocked by a Emerald Armor enemy south of Noel's Sanctuary. After defeating the Emerald Armor you can interact with the Mimic, who will thank you for saving it from the other monster.
Bestiary Description
Mona's Notes: The bane of adventurers everywhere! Mimics are fairly powerful monsters that have magically evolved to take the form of treasure chests to lure in unsuspecting explorers.
The downside of this strategy: they're just as flammable as an actual wooden chest.