The Way Forward
This Quest is given to you by Tarkleigh after entering Submerged Passage.
Tarkleigh asks you to find a way to the forest around the Prison for the betterment of the encampment. He suggests the Emperor's Road. This requires you to travel through the The Prison, and into the The Prisoner's Gate, where the quest will be updated upon witnessing the closing of the road.
Once you reach the Western Forest, you can follow the road to the blocked exit. Press the Engraved Marking, opening the way to the Prisoner's Gate. Talk to Bestel to receive a Passive Skill Point.