Staff of Defense - Glass Staff

{c}Requires Attunement
You have a +1 bonus to your Armor Class.
The staff has 10 charges. You can use your
action to cast: mage armor (1 charge) or shield (2 charges).
The staff regains 1d6 + 4 charges each day at
dawn. If you expend the last charge, roll a d20.
On a 1, the staff shatters and is destroyed.