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Product of Infernal Dalliance (3.5e Feat)
From D&D Wiki
Product of Infernal Dalliance
One of your recent ancestors mated with an infernal creature, and now the tainted blood of a Lower Planar creature flows in your veins. Though you can resist the call of your evil heritage, it manifests itself in an inheritance of fiendish power.
Benefit: You may take any feat with the [Fiend] subtype. In addition, you radiate faint evil, have either two claws or one bite natural weapon, and have Cold Resistance 5 or Fire Resistance 5. When this feat is gained, you also gain the [baazetu], [tanar’ri], [yugoloth], or [demondand] subtype.
Special: Can only be taken at 1st level.