Guide:
On top of the lighthouse at the northeast tip of Northpoint. If you can’t get inside Northpoint city walls you first have to finish the quest “Northpoint in peril” that will take you to using an old smuggler’s tunnel straight into the lighthouse.
As you enter the smuggler’s tunnel for the quest “Northpoint in peril” you will spawn inside the lighthouse. All you need to do is now take the door to the top of the lighthouse.
