One day they were visited by a traveler who spent the night in the cabin receiving his best treatment. The young woman sang for the visitor to fall asleep and have a peaceful sleep, singing a soft and sad song. At dawn the traveler confessing to be an envoy of Tupa and wanted to repay their hospitality by saying that he would fulfill any wish, even the most remote.
The old warrior, knowing that his young daughter would not marry so as not to abandon him, asked that his forces be returned, so that Yari could become free. The messenger of Tupa gave the old man a tree branch of Caa, and taught him how to prepare an infusion that would restore all his vigor.
She also made Yari, the goddess of herbs and protector of the Guarani, being called Caá-Yari, the goddess of yerba mate. And so, the grass was used by all warriors, making them stronger and braver. Just like making the body stay strong and the mind clear for many years.