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]

Health Cultist, Tower Defense Simulator Wiki

MFW I'm 50+ Elites and a dozen master clues dry of a mimic casket to get my music cape back. : r/2007scape

1 kc mimic count from elite chest : r/2007scape

New feature on OSRS Wiki: it can now automatically check off the music tracks you've unlocked : r/2007scape

Evil creature, Old School RuneScape Wiki

Osrs Weiss

How I kill the Mimic Boss

TzKal-Zuk - OSRS Wiki

Zeah RSPS - Wiki

Oldschool Runescape Mimic Boss