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

Brimstone ring - OSRS Wiki

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

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

Can I do mimic? : r/2007scape

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

The Mimic/Strategies - OSRS Wiki

Ava's assembler - OSRS Wiki

TzKal-Zuk - OSRS Wiki

Dagannoth Rex - OSRS Wiki

Dagannoth Kings - OSRS Wiki