Breath Weapons: The avatar uses the breath weapon capabilities of the functional form the avatar has. If the avatar is pure neutral, it can use cone of cold, cloud of fire, and lightning bolt forms of breath weapon. All breath weapon ranges and areas of effect are increased by 50% above those normally used. Saves versus the avatar's breath weapon are made with a -6 penalty. Base breath weapon damage is 24d20+24.
If you want to be nasty, though, you could make him exhale a swarm of ancient dragons.
I like the way you think, Evil.Minty Freshness - I think a "charm" type breath weapon is long over due.
Io breathes ions, of course... He is the Ionic Breeze of the magic world.