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The Kalydonian Boar was a boar that was summoned by Artemis when the city of Kalydon did not give her sufficient offering.

Percy Jackson's Greek Gods

When the king did not give her an offering at a festival, the goddess of the hunt unleashes the boar on the city.

Percy Jackson's Greek Heroes

Atalanta taking out the boar.

Meleager, a prince of the city, leads a hunting party to slay the boar. He manages to finish it off after Atalanta paralyzes it.