Click on Mix and meditate for an hour to brew the potion. Select the Potions tab and then select Potion for Triss. With all of the ingredients in your inventory go back and meditate at the fire in the Hall. Head out to the courtyard where the Frightener was killed and loot it to get the Frightener’s Claw. If you exhaust all dialogue options with him you’ll receive a Red Meteorite. Speak with Vesemir (he should now be in the Hall) and he’ll give you some Celandine and tell you how to get the Frightener’s Claw. Read the books by right clicking on them in your inventory and they will add listings in your journal. You’ll also find some books (The Frightener and the Monstrum books) and other useful items. The White Gull can be found in the Armory (#4), the Calcium Equum from the Evening Hall (#3) on the upper level. There are still some Bandits lurking around on the stairwell to the upper floor and on the upper floor itself. The ingredients are White Gull, Calcium Equum, Celandine and a Frightener’s Claw. Triss reacts badly to magic healing so you’ll need to make a special potion to cure her.

Lambert can be found in the Hall (#1), first outside of the Kitchen and later looking after Triss by the fire. He’ll tell you to talk to Lambert for more information. This quest is initiated once you meditate in the laboratory and speak with Vesemir. After the Bandits attack Kaer Morhen, no matter what path you chose, Triss will be injured.

The witcher how to meditate