Shape Breath

Type: Metabreath
Source: Draconomicon

You can make the area of your breath weapon a cone or a line, as you see fit.
Prerequisite: Con 13, breath weapon, size Small or larger.
Benefit: If you have a line-shaped breath weapon, you can opt to shape it into a cone. Likewise, if you have a cone-shaped breath weapon, you can shape it into a line.
When you use this feat, add +1 to the number of rounds you must wait before using your breath weapon again.
Normal: Without this feat, the shape of your breath weapon is fixed.