Glass Staff (Staff of Defense)

This slender, hollow staff is made of glass, yet is as
strong as oak.
While holding this staff, you have a +1 bonus to
your Armor Class. This staff has 10 charges
({c}). With the staff in hand, you can use 1 action
to cast Mage Armor ({c}) or Shield ({c}{c}). No components are required, but spells must be on
your spell list. This staff regains 1d6 + 4 charges
each day at dawn. If the last charge is expended,
roll a d20. On a 1, the staff shatters.