Each sorcerer has a source of magic somewhere in her heritage that grants her spells, bonus feats, an additional class skill, and other special abilities. This source can represent a blood relation or an extreme event involving a creature somewhere in the family's past. For example, a sorcerer might have a dragon as a distant relative or her grandfather might have signed a terrible contract with a devil. Regardless of the source, this influence manifests in a number of ways as the sorcerer gains levels. A sorcerer must pick one bloodline upon taking her first level of sorcerer. Once made, this choice cannot be changed.
At 3rd level, and every two levels thereafter, a sorcerer learns an additional spell, derived from her bloodline. These spells are in addition to the number of spells given on Table: sorcerer Spells Known. These spells cannot be exchanged for different spells at higher levels.