The Mimic/Strategies - OSRS Wiki

Upon completion of an elite or master clue scroll, the casket received has a chance of turning out to be a mimic chest. Mimic caskets can only 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).

Calvar'ion - OSRS Wiki

New OSRS Mimic Boss kill + loot : r/2007scape

Karil's leatherskirt - OSRS Wiki

Grotesque Guardians - OSRS Wiki

How to turn Mimic Boss On in OSRS / Where to find the Strange Casket

Holy blessing - OSRS Wiki

K'ril Tsutsaroth - OSRS Wiki

Voidwaker - OSRS Wiki

Mimic 2 - Wikipedia

Mimic Guide, Athensps Wiki

Giant Mimic - The RuneScape Wiki