Artificer's Box

This small copper box (6 inch cube) is crested in gold plating. Upon use, the cube extends tripod legs and a small cannon shape on the side. Every turn that the cube is active, it may cast one Magic Missile or Eldritch Blast. Alternatively, it may store one missile each turn (to a maximum of 6) and fire all at once. This cube has 1 Hit Point. Once defeated, the item may not be used until the following dawn, when all of its properties reset. 

Notes: The user must spend 48 hours investigating the item to learn its properties.