Draconic Breath

 
Prerequisite(s): Draconic Heritage
 
Benefit: As a standard action you can convert an arcane spell slot into the breath weapon of your draconic heritage. It manifests as a 30' cone (cold or Fire) or 60' line (Acid or Electricity) that deals 2d6 damage per level of the spell slot you expended. Creatures in range get a reflex check for half damage. The DC is 10 + Spell Level + Cha modifier. If the breath weapon of your Draconic forefathers does not deal damage, you must choose between Cold, Fire, Acid or Electricity.
 
Source: Complete Arcane, Races of the Dragon