Blessing of the Blizzard

You have been blessed by Umberlee, goddess of the storm and sea, bestowing you with power over the winter wind. You gain the following benefits:

• Nimbus Shield. You have resistance to cold damage.
• Boreal Storm. You learn the boreal storm spell and can cast it using any spell slots you have. Your spellcasting ability for this spell is Intelligence, Wisdom, or Charisma (choose when you take this feat).
• Whirlwind Blades. Whenever you use your bonus action for two-weapon fighting, you can make an additional attack with the other weapon. This attack deals extra cold damage equal to the modifier of the ability you chose.