The Night of Long Fangs Main Story, Blood and Wine Quest
Suggested level: 47
This quest will be triggered or can be aquired when you complete Capture the Castle quest.
Stages of "The Night of Long Fangs" quest
1. Kill the vampire.
It was painfully clear the audience with the duchess would not be a pleasant one. For Geralt and Regis had failed to establish Dettlaff's whereabouts, though not for lack of trying. Matters, alas, quickly took an even more tragic turn. When Geralt failed to deliver Syanna to the lover betrayed, he fulfilled his threat and sent down upon Beauclair and its environs a plague of horrid beasts. The witcher immediately resumed his efforts to find and confront Dettlaff.
2. Ask Orianna where to find the Unseen Elder.
This stage is optional! Notice: If you choose this one then you will be able to change your mind during the conversation with Regis at the end of Blood Simple quest.
You will have to run through a city and kill some vampires. Find Oriana and talk to her. She has a new task for you - Blood Simple quest.
2.1. Quest completed.
Geralt had decided - Dettlaff could not be considered harmless. True, he was doubtless a sentient creature as well as Regis' close friend - but no. The witcher would resolve matters with his blade. To do this, Geralt would need to force Dettlaff to reveal himself, then to fight. And this in turn required him to find one of only a handful of ancient vampires remaining in the world. And the only one who could help him with the latter was that legend of the Beauclairois boheme, Orianna.
3. Find Damien and ask him where Syanna is being kept.
This stage is optional! You will have to run through a city and kill some vampires.
3.1. Use your Witcher Senses to track down Damien.
3.2. Follow Damien's unit using your Witcher Senses.
3.3. Kill the vampire attacking Damien's unit.
3.4. Talk to the birds to inform Regis where he should meet you.
3.5. Meet Regis at the palace.
3.6. Get inside the playroom.
The doors are locked but Regis will open them for you.
3.7. Search the playroom to find out what happened to Syanna.
Go upstairs and fithe the Journal. Read it. You will receive a new quest - Beyond Hill and Dale....
3.8. Quest completed.
Geralt heeded Regis' advice and would seek to resolve the crisis through peaceful means. To do so, he would need to fulfill the vampire blackmailer's demand and free Syanna. He now needed to establish where this troublemaker was being held. The witcher suspected he could extract this information from Captain Damien de la Tour, the duchess' confidant in such matters.
Next / new quests are Beyond Hill and Dale... (Main Story, Blood and Wine), Blood Simple (Main Story, Blood and Wine).