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DRAGON COMBAT: BREATH WEAPON (Su)

Using a breath weapon  is a standard action. Once a dragon breathes, it can not breathe again until 1D4 rounds later. If a dragon has more than one type of breath weapon, it still can breathe only once every 1D4 rounds. A blast from a breath weapon always starts at any intersection adjacent to the dragon and extends in a direction of the dragon's choice, with an area as noted on the Dragon Breath Weapon Sizes Table. If the breath weapon deals damage, creatures caught in the area can attempt Reflex saves to take half damage; the DC depends upon the dragon's age and variety, and is given in each individual dragon description. Saves against non-damaging breath weapons use the same DC; the kind of saving throw is noted in the variety descriptions. Breath weapons come in two basic shapes, line and cone, whose areas vary with the dragon's size.

The save DC against a breath weapon is 10 + ½ dragon's HD + dragon's CON modifier.

DRAGON BREATH WEAPON SIZES TABLE

30 ft.
30 ft.
DRAGON SIZE LINE (Length) CONE (Length)

Tiny

30 ft.
15 ft.
Small 40 ft. 20 ft.
Medium 60 ft. 30 ft.
Large 80 ft. 40 ft.
Huge 100 ft. 50 ft.
Gargantuan 120 ft. 60 ft.
Colossal 140 ft. 70 ft.

A Line is always 5 feet high and 5 feet wide.
A Cone is as high and wide as its length.

Based on the entry in Dungeons & Dragons Monster Manual 3.5