Staff of Frost
Staff, very rare (requires attunement by a druid, sorcerer, warlock, or wizard)
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.
Dungeon Master´s Guide (SRD)
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DnD 5e Magic Items › Staff of Frost