Breathblock

Breathblock was a defensive spell that could only be cast by dragons.

Effects
The spell was similar to the shield spell used by humanoid wizards. When cast, an invisible barrier of force manifested around the dragon or an area. The barrier was on each side. The barrier was mobile, so it could be used by a dragon as a shield. If used against the breath weapon of another dragon, the weapon's effects are either deflected away or reflected back to the attacking dragon.

Casting
This spell required only a verbal component.