Draconic Power( Races of the Dragon, p. 104)
You have greater power when manipulating the energies of your heritage.
Draconic Heritage (RDr) , sorcerer level 1st,
Your caster level increases by one, and you add 1 to the save DC of all arcane spells with the descriptor or subschool associated with your draconic heritage.
This feat works in conjunction with the Energy Substitution feat (Complete Arcane, page 79) as long as the substituted energy matches the energy type associated with your draconic heritage.