Exhaled Immunity

(Races of the Dragon, page 102, DnD 3.5)

[Breath]

You can use your breath weapon to grant a willing creature immunity to energy.

Prerequisite

Dragonblood subtype, breath weapon

Benefit

When you use your breath weapon, instead of producing its normal effect, you can choose to grant one willing creature adjacent to you immunity to the energy type of your breath weapon. If your breath weapon doesn't deal energy damage, this feat grants immunity to fire. This immunity lasts for 1d4 rounds. You can't use this feat on yourself.