This quest begins immediately after Heavy Is the Head. You have just one day to burn the parchment in Venonis (defined in game as “before the next dusk”), thereby avoiding the wrath of the zealots. If you’ve been to Venonis before, you can get there quickly by using the synchronization point. Otherwise, your fastest route will be down the rivers Trent and Tame on your longship.
(1 of 3) If you haven’t yet synchronized at Venonis, sailing south will be your quickest route.
However you get there, once you’re in Venonis you should use your raven to identify the general location of the parchment. More specifically, you will find it on a statue within the ruins, as shown above. Interact with the parchment to burn it, completing the quest.