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- Obsessive Compulsive Disorder
- Obur
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- Ogbanje
- Ogoh-ogoh
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- Ohaguro-bettari
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- Olitiau
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- Ondine
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- Oni (Japanese folklore)
- Onocentaur
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- Orcs
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- Orion
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- Phantom
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- Phaya Naga
- Philosophy
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- Pickled dragon
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- Plat-eye
- Please do not bite the newcomers
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- Poltergeists
- Poludnica
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- Pooka
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- Pope Lick Monster
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- Powers of the Vampire
- Powrie
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- R'lyeh
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