To complete the Hunting Magic quest in The Witcher 2, find the Place of Power and get the Crystal required to save Saskia.
Hunting Magic Quest is not easygoing as it will involve you venturing inside the Harpy lair in The Witcher 2. You will get this quest following the events of The War Council quest. In short, you must bring an artifact to Philippa, who will prepare a potion to help Saskia.
If you are having difficulty completing the Hunting Magic quest, then worry not, as I have covered all the details on this specific quest.How to complete the Hunting Magic Quest in Witcher 2
The first part of the Hunting Magic Quest will involve you meeting with a dice poker player called Skalen Burdon at Vergen. He will inform you about a certain wizard in The Witcher 2. After that, you can visit the Barkeep to learn more about the Place of Power and how you can save Saskia.
For that, you can head towards the bar present at the corner. After entering it, the barkeep will be seated at one end of the table. Speak with him and tell him that Saskia needs saving, which can only be done by finding the magic artifact first.
Once you can do that, Cecil Philippa can produce an antidote to help Saskia in the Witcher 2. The Barkeep will then tell you to seek out the Runes in the forest beyond Vergen. According to him, there will be a Place of Power there, and you can discover the artifact/crystal.Find the Place of Power in The Witcher 2
To get to the Place of Power, you must follow the road I have highlighted in blue on the map above. You must cross the river and follow the path until you reach a narrow pathway. You need to keep following the way, and after you observe the pond on your left, you need to change your direction and head west from there.
Then, you need to move past the edge on your left side, and along the way, you will encounter monsters such as Nekker and Harpy in The Witcher 2.
