While you hold this magical staff, you have resistance to cold damage, fire damage, and necrotic damage, and you gain a +2 bonus to the damage rolls of spells you cast that deal cold damage.

The staff has 50 charges for the following properties. It regains 4d6 + 2 expended charges daily at dawn. If you expend the last charge, roll a 20. On a 20, the staff regains 1d12 + 1 charges.

Glacial Transformation. You can use an action to raise the staff high whenever you are not indoors or underground and dissolve it into icy winds above you. The winds scatter into the sky, and the staff is destroyed.

Over the next 50 days and 1 hour, snow falls within 1 mile of that location and magically forms into a small glacier covering that area. Then the glacier begins to move normally, and the weather returns to normal (for a glacier). The glacier has a radius of at least 1 mile, and the DM determines its overall size, shape, speed, and temperature. The time it takes the glacier to form is reduced by one day for each charge in the staff. If this 9th-level spell effect is dispelled before the glacier finishes forming, the area returns to its original state.

Snow Flurry. While holding the staff, you can use an action to expend up to 5 charges to fill the area within 15 feet of you with frigid snowy winds. Each creature other than you in the area succeed on a Constitution saving throw against your spell save DC, or else take 4d8 cold damage plus 1d8 additional cold damage for each charge expended and have its speed reduced by 15 feet until the end of its next turn. Ground in the area is covered with snow and becomes difficult terrain for the next 10 minutes, or 1 minute in a hot environment.

Spells. While holding the staff, you can use an action to expend some of its charges to cast one of the following spells from it, using your spell save DC and spell-casting ability: cold snap (new) (3 charges), cone of cold (9th-level version, 7 charges), control weather (can't change temperature to stages 1–3, 7 charges), death ward (4 charges), encasing ice (new) (10 charges), feign death (3 charges), frost armor (new) (4 charges), ice storm (4 charges), otiluke's freezing sphere (6 charges), sleet storm (3 charges), or wall of ice (6 charges).

You can also use an action to cast one of the following spells from the staff without using any charges: fog cloud, frostbite,* gust,* gust of wind, ice sculpture (new), ray of frost, or shape water.*

Notes: Resistance: Cold, Resistance: Fire, Resistance: Necrotic, Damage: Cold, Druid, Sorcerer, Warlock, or Wizard, Buff, Exploration, Combat, Warding