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This link potentially matches multiple versions of "Ancient Brass Dragon":

• Ancient Brass Dragon (System Reference Document 5.2)

  CR 20 · Dragon (Gargantuan)

• Ancient Brass Dragon (System Reference Document 5.1)

  CR 20 · Dragon (Gargantuan)

• Ancient Brass Dragon (Monstrous Menagerie)

  CR 22 · Dragon (Gargantuan)

• Ancient Brass Dragon (Black Flag SRD)

  CR 17 · Dragon (Gargantuan)