Corrupt Spell-Like Ability [General] (from the Book of Vile Darkness)
Your spell-like abilities are powered by evil. A dark pact provides you with unholy energy.
Prerequisite: Evil alignment.
Benefit: This feat adds the evil descriptor to your spell-like abilities. Furthermore, if a spell-like ability deals damage, half of that damage (rounded down) is unholy damage. Each of your spell-like abilities can be corrupted three times per day, though this feat does not allow you to exceed your normal usage limit for any ability.
Special: This feat can be taken multiple times. Each time it is taken, you can apply it to each of your spell-like abilities three additional times per day.
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