White Chromatic Rose

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
ft 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.