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This link potentially matches multiple versions of "Couatl":

• Couatl (System Reference Document 5.2)

  CR 4 · Celestial (Medium)

• Couatl (System Reference Document 5.1)

  CR 4 · Celestial (Medium)

• Couatl (Monstrous Menagerie)

  CR 4 · Celestial (Medium)

• Couatl (Black Flag SRD)

  CR 4 · Celestial (Medium)