The Tarnished key is given by the Head Mourner and is used to free the Gnome from the prison. It cannot be put on the Steel Key Ring.

If you lose the key, it can be retrieved by searching the Head Mourner's desk.

v • d • e Keys (excluding single-use quest keys)
Steel key ring keys	Ancestral key • Battered key • Brass key • Crystal-mine key • Dusty key • Enchanted key • Maze key • Metal key • New key • Shiny key • Shortcut key • Weapon store key
H.A.M.	Bronze key (H.A.M.) • Iron key (H.A.M.) • Steel key (H.A.M.) • Silver key (H.A.M.)
Shades of Mort'ton keys	Bronze Red • Brown • Crimson • Black • Purple Steel Red • Brown • Crimson • Black • Purple Black Red • Brown • Crimson • Black • Purple Silver Red • Brown • Crimson • Black • Purple Gold Gold
Others	Crystal key • Tooth half of a key • Loop half of a key • Dragonkin key • Strange key teeth • Strange key loop • Key (Treasure Trails) • Muddy key • Prison key (Prison Pete) • Sinister key • Tarnished key • Iron key