Type: Metabreath
Source: Draconomicon
You can split your breath weapon into a pair of weaker effects.
Prerequisite: Con 13, breath weapon, Shape Breath, size Small or larger.
Benefit: Your breath weapon retains its size and shape, but splits into two areas that you aim separately. Each portion deals half the damage the breath weapon normally deals or lasts half as long as the effect normally lasts.
For example, an old silver dragon that uses this feat on its cold breath weapon produces two 50-foot cones of cold that deal 8d8 points of cold damage each. If the same dragon used this feat on its paralyzing gas breath weapon, it would produce two cones of gas, each of which could paralyze a creature for 1d3+4 rounds.
You can aim the split breath effects so that their areas overlap. Creatures caught in the area of overlap are struck by both weapons and are affected twice, subject to all the normal rules for stacking magical effects.
When you use this feat, add +1 to the number of to you must wait before using your breath weapon again.