Catch the Breath — Open RPG Guide

Casting Time: 1 reaction, which you take when you make a saving throw against a breath weapon attack
Range: Self
Components: V
Duration: Instantaneous

You can cast this spell as a reaction when you’re targeted by a breath weapon. Doing so gives you advantage on your saving throw against the breath weapon. If your saving throw succeeds, you take no damage from the attack even if a successful save normally only halves the damage.

Whether your saving throw succeeded or failed, you absorb and store energy from the attack. On your next turn, you can make a ranged spell attack against a target within 60 feet. On a hit, the target takes 3d10 force damage. If you opt not to make this attack, the stored energy dissipates harmlessly.