Wand of Lightning Bolts

While holding this wand, you can use an action to expend 1 or more charges to cast __lightning bolt_ (save DC 15). For 1 charge, you cast the spell’s 3rd-level version. Increase the spell slot level by one for each additional expended charge. This wand has 7 charges and regains 1d6+1 expended charges each dawn. When the last charge is expended, roll a d20\. On a 1, the wand emits sparks of electricity and disappears in a flash.