Firewood Accordion

Wondrous item, very rare (requires attunement by a bard)

This accordion emits a crackling dirge when played and sends motes of flame lurching from it as air passes through. If you're attuned to the instrument, you are proficient with it. While you're attuned to the accordion and have it on your person, you have resistance to fire damage.

Explode. While holding the instrument with two hands, you can use an action to play a note so foul that the accordion explodes, sending out a wave of fire in all directions. Each creature within 40 feet of the accordion (including you) must make a DC 16 Dexterity saving throw. A creature takes 14d6 fire damage on a failed save, or half as much damage on a successful one. The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried. The instrument is then destroyed.

Flame Stoke. The instrument contains an ever-burning fire inside of it, which you stoke by playing it. While holding the accordion with two hands, you can use a bonus action to play it. When you do, the instrument gains 1 charge, or 2 charges if you also played it the previous turn, up to a total maximum of 5 charges. The instrument loses all charges if you end your second consecutive turn without using a bonus action to stoke the fire. Using your Bardic Inspiration as a bonus action also stokes the instrument's flame; doing so increases the charges gained from it by 2.

Spells. While holding the instrument with two hands, you can use an action to expend some of its charges to cast one of the following spells from it, using your spell attack bonus and spell save DC: burning hands (3rd-level version; 3 charges), produce flame (the flame appears above the accordion; no charges), or thunderwave (3rd-level version; 3 charges). Creatures that succeed on the saving throw against a spell cast in this way take no damage from the effect, and if you're concentrating on a spell cast from the accordion. When produce flame deals damage to a target, the fire damage it deals depends on the number of charges remaining in the instrument: 1 or fewer charges (1d8), 2 charges (2d8), 3 charges (3d8), or 4 or more charges (4d8).

Play it well, and you’ll set hearts ablaze. Play it poorly, and you might just set the tavern on fire—again.