Breath of Bahamut

You summon the breath of Bahamut himself to punish those who have done evil deeds. You exhale out a wave of icy cold breath in a 30 ft cone in front of you. Any creatures you choose must make a Constitution saving throw, taking 6d6 cold damage on a failed save, or half as much on a successful one. Additionally, any ally creatures you choose gain temporary HP equal to the number rolled on the damage dice.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 2d6 for each slot level above 4th.