Staff of Warding (5e Equipment)

Staff, very rare (requires attunement by a bard, druid, sorcerer, warlock, or wizard)

Once attuned and wielded, this staff will often attempt to place itself between you and whatever you perceive as danger. This will not disrupt or advantage you, but it is noticeable.
The staff has 20 charges. While holding it, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC: absorb elements (1 charge), banishment (4 charges), counterspell (3 charges, +1 for each spell level above 3rd), or shield (1 charge).
When used for a counterspell the staff will know the right level to cast the counterspell, and will automatically spend the charges needed to block the spell.
The staff regains 1d8 + 2 expended charges daily at dawn. If you expend the last charge not during a counterspell, roll a d20. On a 1, the staff is destroyed and dissolves into a shimmering band of force that covers you, granting you a +2 bonus to your AC until the end of your next turn.