Generations ago, a demon spread its filth into your heritage. While it does not manifest in all of your kin, for you it is particularly strong. You might sometimes have urges to chaos or evil, but your destiny (and alignment) is up to you.
Class Skill: Knowledge (planes).
Bloodline Arcana: Whenever you cast a spell of the summoning subschool, the creatures summoned gain DR/good equal to 1/2 your sorcerer level (minimum 1). This does not stack with any DR the creature might have.
Bloodline Powers: While some would say that you are possessed, you know better. The demonic influence in your blood grows as you gain power.
Claws (Su): At 1st level, you can grow claws as a free action. These claws are treated as natural weapons, allowing you to make two claw attacks as a full attack action using your full base attack bonus. These attacks deal 1d4 points of damage each (1d3 if you are Small) plus your Strength modifier. At 5th level, these claws are considered magic weapons for the purpose of overcoming DR. At 7th level, the damage increases by one step to 1d6 points of damage (1d4 if you are Small). At 11th level, these claws become flaming weapons, each dealing an additional 1d6 points of fire damage on a successful hit. You can use your claws for a number of rounds per day equal to 3 + your Charisma modifier. These rounds do not need to be consecutive.
Demon Resistances (Ex): At 3rd level, you gain resist electricity 5 and a +2 bonus on saving throws made against poison. At 9th level, your resistance to electricity increases to 10 and your bonus on poison saving throws increases to +4.
Demonic Might (Su): At 20th level, the power of the Abyss flows through you. You gain immunity to electricity and poison. You also gain resistance to acid 10, cold 10, and fire 10, and gain telepathy with a range of 60 feet (allowing you to communicate with any creature that can speak a language).