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).

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

Trident of the seas - OSRS Wiki

Nex - OSRS Wiki

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

Karil's leatherskirt - OSRS Wiki

How I kill the Mimic Boss

How I kill the Mimic Boss

Zaryte vambraces - OSRS Wiki

Clue scroll (medium) - OSRS Wiki

Cerberus - OSRS Wiki