Draconic Resistance( Races of the Dragon, p. 105)
Your bloodline hardens your body against effects related to the nature of your progenitor.
Draconic Heritage (RDr) , sorcerer level 1st,
You gain resistance to the energy type associated with your draconic heritage equal to three times the number of draconic feats you have, including draconic feats you take after gaining this feat.
This feat grants no benefit to a character whose draconic heritage is not associated with an energy type, such as a sorcerer with pan lung heritage.