Antharas Watchman Theodric:
If you sincerely wish to confront Antharas, go meet with Gabrielle, the leader of the Seal Guardians, and be recognized as an Antharas vanquisher. She is currently staying at Giran Castle Town.
If you come back to see me with the Mark of Watchman, I, Antharas Watchman Theodric, will give you a Portal Stone...