Just noted that wind wall (see text below) stops some forms of breath weapons.
Which dragons have Gaseous breath weapons?
Which other creatures?
I imagine the scenario would be: readying to cast wind wall if the dragon breathes.
Text:
DESCRIPTION
An invisible vertical curtain of wind appears. It is 2 feet thick and of considerable strength. It is a roaring blast sufficient to blow away any bird smaller than an eagle, or tear papers and similar materials from unsuspecting hands. (A Reflex save allows a creature to maintain its grasp on an object.) Tiny and Small flying creatures cannot pass through the barrier. Loose materials and cloth garments fly upward when caught in a wind wall. Arrows and bolts are deflected upward and miss, while any other normal ranged weapon passing through the wall has a 30% miss chance. (A giant-thrown boulder, a siege engine projectile, and other massive ranged weapons are not affected.) Gases, most gaseous breath weapons, and creatures in gaseous form cannot pass through the wall (although it is no barrier to incorporeal creatures).
While the wall must be vertical, you can shape it in any continuous path along the ground that you like. It is possible to create cylindrical or square wind walls to enclose specific points.
Which dragons have Gaseous breath weapons?
Some metallic dragons have gas breath weapons besides thier damaging ones.
Brass dragon: Cone of sleep gas.
bronze dragon: cone of repulsion gas.
copper dragon: cone of slowing gas.
gold dragon: cone of weakening gas.
silver dragon: cone of paralyzing gas
Long ago green dragons used to breath chlorine gas. Now it is just a cone of acid which will be unaffected by wind wall. The one exception is if a green dragon uses the Miasma power, that makes it's breath a cloud of acid.
I did not know it could not some breath weapons. Thanks for the info.
Thanks frank the man