The Tale of Iyo is the four-player raid in Ghost of Tsushima: Legends. It became available on October 30, 2020, in patch 1.14, shortly after the release of Legends. It is a three-part tale that is available only after the completion of "The Fire Spirits of Yarikawa", and requires four players to initialize and complete. Prior to patch 1.18, parties had to be pre-determined, but as of patch 1.18, players can match-make with others to complete this raid.
The Tale of Iyo revolves between the Ghosts who have managed to enter Iyo's realm. As the Ghosts survive the treacherous ordeals of death, they have managed to find themselves as the greatest and final battle begins. After annihilating the last stand of her army of Oni, and Iyo herself, the onibaba was vanquished, signaling the end of her reign.