The Toussaint Prison Experiment is a treasure hunt quest in the Blood and Wine expansion.


Upon arriving in the ruins of the prison, a mysterious hooded figure stands still in the middle of the area. Approaching the figure will reveal it to be a pretty powerful alp. Combinations of Yrden, moon dust, and Black Blood will prove useful in fighting the monster. After disposing of her search the nearby corpse to find the Clerk's diary, read it and the search for the casket, which is located east from the marker behind a wall, open it and take all the loot and the quest ends.

Journal Entry

Wandering about the slopes of Mount Gorgon, Geralt came upon some grim, foreboding ruins. He set about exploring them and nearly tripped over a corpse. As always, he searched the body for a journal or letter that could shed some light on the circumstances of the individual's death. This time, too, this routine paid off. He found a journal and a key...
The journal detailed an unsuccessful experiment that had resulted in Bastoy Prison being destroyed. The witcher also learned of a chest full of gold that remained hidden within the ruins.
Geralt located the chest. The key he had found with the journal worked like a charm. So the witcher scooped up the gold and ran off to spend it!


  • Read the journal.
  • Find the treasure.


  • The name is in reference to the Stanford prison experiment, a well known experiment that was meant to study the effects of perceived power between prisoners and prison guards but was called off after just 6 days due to the abuse that went on.
  • The experiment describes Bastøy Prison outside Oslo, Norway.
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