Your innate magic derives from infernal ancestors. Your blood is thick with their power, allowing you to exhibit a variety of abilities.
Prerequisite: Sorcerer level 1st.
Benefit: You gain a bonus on saves against fire and poison equal to the number of infernal sorcerer heritage feats you possess. When you use a conjuration (summoning) spell to summon an evil outsider, you gain a +2 bonus to your caster level.
Source: Player’s Handbook II, page 91.