Alethra's Flame Ward

For the duration of the spell, whenever you are targeted by a spell that deals fire damage which allows you to make a saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail. Whenever you avoid damage from such a spell in that way,  you can force a target within 30 feet of you to make a Dexterity saving throw. On a failure, they take an amount of fire damage equal to the amount you avoided, or half as much on a success. If the spell deals any other types of damage in addition to fire, it isn't affected by this spell.