Aegis of Flame

A massive fiery shield materializes to protect you or one of your allies and fires a gout of flame at the attacker. When you or a creature in range is attacked you can give yourself or the creature a +5 bonus to AC until the end of your next turn. In addition the attacker must make a Dexterity saving throw and on a failed save 4d10 fire damage or half as much on a successful save.

 At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the fire damage increases by 1d10 for each level above 4th