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This link potentially matches multiple versions of "Gibbering Mouther":

• Gibbering Mouther (Monstrous Menagerie)

  CR 2 · Aberration (Medium)

• Gibbering Mouther (System Reference Document 5.2)

  CR 2 · Aberration (Medium)

• Gibbering Mouther (System Reference Document 5.1)

  CR 2 · Aberration (Medium)

• Gibbering Mouther (Black Flag SRD)

  CR 2 · Aberration (Medium)