Traelius is a Breton mage who studies and lives alone in the Dire Warren cave in the Shivering Isles. He is the lover of Alyssa, who left him due to her dislike of their current home.

His journal details Alyssa's departure and his thoughts concerning it.

He is usually hostile, although this is not always the case; it could be a bug or is a situation which requires Traelius to have a high disposition towards the Hero. He also has no greeting when spoken to by the Hero.