Dragonfire

This spell was designed for hunting evil dragons, intended to neutralize their dangerous breath attacks, but also to make it catch in their throat and empower it to backfire upon them.

The dragon attempting to use its breath attack must make a Con save against the casters spell DC. If it fails, it wastes its breath attack and will take damage as if hit by its breath attack. This ignores any resistance or immunities the dragon has. If it passes, the dragon uses its breath attack, but the attack is still weakened. Any save to avoid it, gains a bonus equal to the level of spell slot used to cast this.