Mysterious Box
From MHWiki
Mysterious Box is dropped by the Acolyte Mouse in the Acolyte Realm. It is placed in the "Misc" inventory tab and cannot be opened yet.
Description
A box made of strange, unrecognizable metal with ornate etchings upon it. A barely audible humming seems to be emanating from the corners as though the metal is vibrating at an unmeasurably high frequency.