Bastille Day
King Xavier will ask you for proof of the things going on in Pinnacle. Accept the quest.
The Bastille is located on the south of town.
Approach the guard and tell him the password the king told you so he will let you through.
Clear the enemies in the area just to keep things clean. Afterwards, enter the Bastille.
Inside, your objective lies at the end of this map so make your way there or eliminate all the mages in this map for the quest "Magic Without Honor".
On the quest marker's location, you will find Prince Syrion being silly so put an end to his sick dreams.
He will be invulnerable at the beginning of the fight no matter what you try to do to him. But you would notice the energy coming from the big glowing orbs around him.
Head over to the base of those orbs and take out the Extractor Guardians. These things keep healing the prince and all four of them should be removed.
With the Extractors down, the prince can be fought normally without him healing like crazy.
You will find the ember Smuggling Journal on his body. Take it as the quest requires it.
Return to King Xavier and show him the book and tell him about his son to complete the quest.