When you cast this spell the breath weapon you gain and ice spells you cast ignore immunity and they cannot be absorbed for the sake of healing. 

While under the effect of this spell you gain the following effects:

- You gain immunity to cold damage and resistance to fire damage

- When you cast this spell you gain 75 temporary hit points

- The area 60ft around you becomes difficult terrain to those hostile to you or your allies. This includes the air around you. 

- Sources of fire (including magical) are snuffed (or dispelled) and water instantly freezes

Lastly you gain a breath attack: As an action, you can use your breath weapon to unleash a wave of cold towards the enemy. In a 30ft cone, targets must make a constitution saving throw or take 8d6 cold damage; on a successful save they take half. Additionally on a failed save the target is incapacitated.