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This link potentially matches multiple versions of "Swarm of Ravens":

• Swarm of Ravens (Monstrous Menagerie)

  CR 1/4 · Beast (Medium)

• Swarm of Ravens (System Reference Document 5.1)

  CR 1/4 · Beast (Medium)

• Swarm of Ravens (System Reference Document 5.2)

  CR 1/4 · Beast (Medium)