Wand of Lightning Bolts

This wand has 7 charges. While holding it, you
can use an action to expend 1 or more of its
charges to cast the lightning bolt spell (save DC 15) from it. For 1 charge, you cast the 3rd-level version
of the spell. You can increase the spell slot level
by one for each additional charge you expend.
The wand regains 1d6 + 1 expended charges daily
at dawn. If you expend the wand's last charge, roll
a d20. On a 1, the wand crumbles into ashes and is destroyed.