Abominable Form

Feat
You gain the ability to channel magic into your frosty nature. As an action, you can expend a use of your Wild Shape feature to awaken the cold and rather than transforming into a beast form, and you gain 4 temporary hit points for each level you have in this class. 

When a creature you can see moves into a space within 10 feet of you or starts its turn there, you can use your reaction to deal 1d4 cold damage to that creature unless it succeeds on a Constitution saving throw against your spell save DC. The cold damage increases to 1d6 at 6th level, 1d8 at 10th level, and 1d10 at 14th level.

While in this form you a resistance to cold damage but vulnerable to fire damage. 

These benefits last for 10 minutes, until you lose all these temporary hit points, or until you use your Wild Shape again.