Pain (mythology)
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Pain was an Eternal and was one of the gods of Gallifrey. She represented and embodied pain.
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She was older than even Death herself.
She appeared in Benny's dream, telling her about a vulnerable nerve cluster on a time lord's shoulder. (NA: Set Piece)
Champion
If The Doctor is Time's Champion and The Master is Death's Champion then who is Pain's Champion I always thought it was The Rani but I don't think so.