Staff of Frost

From Dungeon Master's Guide, page 202. Found on Magic Item Table H.

Description
''Staff, very rare (requires attunement by a druid, sorcerer, warlock, or wizard). 4 lbs.''

You have resistance to cold damage while you hold this staff.

The staff has 10 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: Cone of Cold (5 charges), Fog Cloud (1 charge), Ice Storm (4 charges), or Wall of Ice (4 charges).

The staff regains 1d6+4 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1. the staff turns to water and is destroyed.