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This link potentially matches multiple versions of "Pit Fiend":

• Pit Fiend (System Reference Document 5.2)

  CR 20 · Fiend (Large)

• Pit Fiend (System Reference Document 5.1)

  CR 20 · Fiend (Large)

• Pit Fiend (Monstrous Menagerie)

  CR 20 · Fiend (Large)

• Pit Fiend (Black Flag SRD)

  CR 20 · Fiend (Large)