White Chromatic Rose
Wondrous Item, rare
While this rose is held, it is covered in frost as a harmless visual effect.
While holding the rose by its stem, you gain resistance to cold damage. If you would take more than 10 cold damage from a single source (after applying the resistance), the rose disintegrates, and you take no damage instead.
As an action, you can blow the petals from the rose to produce a 20-foot cone of cold. Each creature in the cone must make a DC 15 Constitution saving throw, taking 3d10 cold damage on a failed save, or half as much damage on a successful one. Using this property destroys the rose.
Source: The Wild Beyond the Witchlight p. 208