Staff of Defence

Glass staff, required attunement
Holding staff grants a +1 bonus to armor class.
10 charges: If on your spell list, you can spend
charges as an action to cast Mage armor
(1 charge) or Shield (2 charges)
Staff regains 1d6+4 charges at dawn. If last
charge is expended, roll a d20; on a 1, the
staff shatters and is destroyed.