Artillery Gun from Bresk

This artillery gun requires 1 hand. The gun has 2 charges.
While holding it, you can use an action to axpend 1 of its fuel charges to shoot the following spell from it, using DC 13 burning hands

The staff regains 2 expended charges after a long rest, if you spend some downtime on it. If you expend the last charge, roll a d20. On a 1, the gun blackens, crumbles into cinders, and is destroyed.

Notes: Requires proficiency in firearms, Damage, Combat