Terwen is a seer that appears in the Falor and Terwen scenario of the Birth of a Barbarian campaign in Heroes of Might and Magic III: The Shadow of Death. Yog must deliver the Celestial Necklace of Bliss and the Lion's Shield of Courage to Terwen and his friend Falor.
Falor and Twerven were two seers living in Erathia. When Yog was offered a place in Krewlod's armies, Duke Winston Boragus also gave him a test to show his commitment: he was to take the pieces of the Angelic Alliance and distribute the pieces to seers in Tatalia, Erathia, and Bracada. The Celestial Necklace of Bliss and the Lion's Shield of Courage were to be taken to Falor and Twerven.
Yog had to fight the Erathian forces in the area, but eventually found the two seers in a cave in the middle of a lake. When he arrived there, Terwen rudely told him to give them the artifacts and leave, before giving him a Pendant of Courage to take back to Boragus as proof that he had completed his mission. As Yog left, Falor came up to him and apologized for his friend's behavior. He shook Yog's hand and wished him luck on his quest.