The Luisón (Luisõ in Guaraní) is one of the seven legendary beasts of Paraguay, and is the seventh and last son of Tau and Kerana. The myth says that in a family with seven male children, the last child will become Luisón.

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In the original version of the myth, Luisón was the seventh and last child of Tau and Kerana, and thus was the most accursed. He appeared to be a giant dog, and was said to be extremely ugly, even horrendous looking.

The myth tells that the seventh son in a family will become Luisón when he reaches adolescence.

• "Cry Luison"

• E-Learning Queen: Folklore and the Horrors of War: "El Luison"
• https://www.smithsonianmag.com/smart-news/argentina-has-superstition-7th-sons-will-turn-werewolves-180953746/
• Argentina, a Primary Source Cultural Guide