Route: Short run from Wai Jhou, the Jailer is inside the bunker.
Just north of the Jailer is a hidden wall, behind it is a hidden portal (does not show up on radar) to Jester's Prison, double click the portal to enter. The Jester's Prison Door inside is Resistance 9999 to lockpick.
Lore & Dialog
Jailer tells you, "Begone! Only Lord Cynreft may visit the prisoner."
Jailer tells you, "You have not heard of the prisoner? So powerful and so very mad. Once he entertained the court of Mhoire with his antics, but that was before the betrayal. Now he is imprisoned here for all time."
Jailer tells you, "Go now. You have no business here."