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This link potentially matches multiple versions of "Aboleth":

• Aboleth (System Reference Document 5.2)

  CR 10 · Aberration (Large)

• Aboleth (Black Flag SRD)

  CR 10 · Aberration (Large)

• Aboleth (System Reference Document 5.1)

  CR 10 · Aberration (Large)

• Aboleth (Monstrous Menagerie)

  CR 11 · Aberration (Large)