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This link potentially matches multiple versions of "Dust Mephit":

• Dust Mephit (System Reference Document 5.2)

  CR 1/2 · Elemental (Small)

• Dust Mephit (Monstrous Menagerie)

  CR 1/2 · Elemental (Small)

• Dust Mephit (System Reference Document 5.1)

  CR 1/2 · Elemental (Small)

• Dust Mephit (Black Flag SRD)

  CR 1/2 · Elemental (Small)