Winter's Bite

6th-Level Druid, Circle of the Winter Pheonix Feature

Your attacks in beast form or Animalistic Adaptation deal an additional 1d6 cold damage, and your attacks in beast form count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.
In addition, the extra cold damage you do increases by an additional 1d6 at 12th level and again at 18th level