A year later, Cormac, missing his family, followed their path into a misty, unfamiliar land. This was the #Otherworld, a place of beautiful meadows, woods filled with singing birds, and flowers he’d never seen before. He encountered Manannan and Fand in a grand Dún, where he was invited to stay for the night.
In the Dún, Cormac was presented with the magical cup of Manannan. This cup would break when a lie was spoken and would only get whole again when a truth was told.
Cormac was reunited with his family. The joy of their reunion was immense, and they returned to their people, bringing with them Manannan‘s treasures: the bell-branch and the magical cup and the cloth of gold that had covered the table where they sat in the palace of Manannan.
Source: The Vanishing of Cormac | Emerald Isle Irish and #Celtic myths, fairy tales and legends