Hunting a Witch is a main quest in the Witcher 3. It is given automatically to you once you’ve completed “The Nilfgaardian Connection” and “Bloody Baron” main quests.
The notes left by Hendrik, the Nilfgaardian agent, mentioned that Ciri had quarreled with some witch, and that the newt-stewer in question could be found near the village of Midcopse. Exactly where, Gerald did not know – and so he was forced to swallow his manly pride and ask the locals for directions.
Following contains quest spoilers. You’ve been warned
Eavesdrop on the gossiping women.
I’ve failed :c
Keep your distance from the gossiping ladies, so they don’t see you eavesdropping.
Talk to the peasant who visits the witch often.
Find the pond by the village.
Find the lone boulder.
Find the abandoned cart.
Find the witch’s hut.
Talk to the witch in her hut.
Search the hut using your Witcher Senses.
Examine the skull.
Enter the portal in the witch’s hut.
Find the witch.
The quest ends once you get close to the witch.