Spider Staff

The top of this black adamantine staff is shaped like a spider.
This staff can be used as a quarterstaff and
deals an extra 1d6 poison damage. This staff has
10 charges, which can be used to cast Spider
Climb (1 charge) and Web (2 charges, spell save
DC 15) if they're in the spellcaster's spell list.
The staff regains 1d6 + 4 charges each day at
dusk. Upon the last charge being used, roll a d20.
On a 1, the staff crumbles to dust and is destroyed.