The Mimic - OSRS Wiki

The Mimic is a sporadic boss who can be fought by presenting a mimic casket to the strange casket found upstairs in Watson's house. Mimics can be obtained from an elite or master reward casket after asking the strange casket to enable the chance to obtain a mimic casket (which is disabled by default). The elite reward casket has a 1/35 chance of being a mimic, while master reward caskets have a 1/15 chance.[1]

The Mimic - OSRS Wiki

Mimic - OSRS Wiki

OSRS' Treasure Trails Update: Mimic Boss Changes, Beginner Scroll Clues, Stackable Caskets and More

OSRS' Treasure Trails Update: Mimic Boss Changes, Beginner Scroll Clues, Stackable Caskets and More

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The Mimic - OSRS Wiki

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