Blood Simple Main Story, Blood and Wine Quest
This quest is optional. If you want to do it then during The Night of Long Fangs quest you have to ask Orianna where to find the Unseen Elder.
Suggested level: 47
This quest will be triggered or can be aquired when you complete The Night of Long Fangs quest.
Stages of "Blood Simple" quest
1. Search the orphanage using your Witcher Senses.
Geralt had waded through the city's vampire-infested streets to reach Orianna's estate. The vampiress, however, was hardly eager to help the witcher find the Unseen Elder. She was on her way out, about to leave Beauclair for the orphanage she maintained outside the city walls. Anxious about what she might find there, she had neither the time nor the desire nor the patience to listen to the witcher's arguments. Geralt had no choice but to accompany Orianna, hoping to convince her along the way.
Examine the corpses and follow the footprints. To speed up, you can go directly to the place where Roach is, and check body and footprins there.
2. Follow the wagon tracks using your Witcher Senses.
Orianna's concerns had been completely justified. One of the vampires Dettlaff had summoned - a garkain, Geralt concluded, based on the clues he found - had perpetrated a bloody massacre. Enraged by what she found, Orianna pledged to help the witcher find the Unseen Elder - on one condition. Geralt had first to bring her the head of her wards' murderer. If I know Geralt, however, he would have hunted the bastard down without the promise of any reward.
8. Return to Orianna.
Orianna will tell you where you should go if you want to meet Unseen Elder, and give you a Magic key to activate the secret entrance.
9. Tell the birds you're ready to meet Regis.
Geralt had slain the garkain, but when he rejoined Orianna, he learned the old vampiress was, in fact, not much better than the brute she had asked the witcher to hunt down and kill. Though his hand itched to grab the hilt of his silver sword once more and tend to Orianna as he had tended to the garkain, he was well aware saving the city's inhabitants was far more important at the time. Nonetheless, I suspect the witcher and the vampiress will meet again one day...
10. Meet Regis at the docks.
It's the last chance to change your mind.
Warning: If you go to a meeting with Unseen Elder than both sisters would die (one of the possible endings).
11. Quest completed.
As the witcher met once more with Regis, two possible paths lay before him. He now had to choose between meeting with the Unseen Elder or finding Syanna.
If you have decided to meet Unseen Elder then you will receive new quest What Lies Unseen.
If you have changed your mind then you will be back to The Night of Long Fangs quest.
Next / new quest is What Lies Unseen (Main Story, Blood and Wine).