Casket of Embers

Wondrous item, very rare

A heavy iron lockbox, glowing faintly orange at the seams. It is uncomfortably hot to hold for long periods.

Properties

The Casket contains the concentrated essence of the Elemental Plane of Fire.

Primal Release: As an action, you can open the casket, unleashing a torrent of flame in a 60-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw, taking 8d6 fire damage on a failed save, or half as much damage on a successful one. The flames ignite flammable objects that aren't being worn or carried.

Summoning: Once per day, you can use an action to open the casket and cast conjure elemental (fire elemental only) as a 6th-level spell. The elemental is hostile to anyone who attacks it, but otherwise follows your verbal commands.