Staff of Defense

(requires attunement)
While holding the staff, you have a +1 bonus AC.
Charges: x10 {c}
Magic Armor {c}
Shield {c}{c}
—
The staff regains 1d6 + 4 expended charges each
day at dawn.
If you expend the staff's last charge, roll a d20.
On a 1, the staff shatters and is destroyed.