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]

LOOT FROM 100 MIMIC KILLS : & Clue Scroll Boss Mimic Guide ( OSRS BOSS ) : HUGE Giveaway

Great Olm - OSRS Wiki

Slaying The Master Mimic

Loot from trying to get 1 mimic : r/2007scape

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

Accepted Suggestion - Game] Mimic aka clue scroll boss - Handled Suggestions - Alora RSPS

Corrupted Gauntlet Osrs

Osrs Weiss

Mimic Display - OSRS Wiki

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