Glass staff of defense

Holding this staff grants a +1 bonus to AC.
10 charges.
It can be used to cast one of the following spells:
- Mage Armor (1 charge)
- Shield (2 charges)
The staff regains 1d8 expended charges each
day at dawn. If the last staffs charge is expended,
roll a d20. On a 1, the staff is destroyed.