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This link potentially matches multiple versions of "Darkmantle":

• Darkmantle (System Reference Document 5.2)

  CR 1/2 · Aberration (Small)

• Darkmantle (Monstrous Menagerie)

  CR 1/2 · Monstrosity (Small)

• Darkmantle (Black Flag SRD)

  CR 1/2 · Monstrosity (Small)

• Darkmantle (System Reference Document 5.1)

  CR 1/2 · Monstrosity (Small)