This page of the Resident Evil Village guide lists unique Treasures that you can add to your collection while exploring the Reservoir, the vast flooded area explored while looking for Moreau. We explain what secrets can be found in the reservoir and if they have any additional features.
Additional Information - Only unique treasures, i.e. those that appear in a specific part of the game world, are included in the following list. We have not included "common" treasures that may be dropped by some regular monsters, for example.
These treasures are dropped by Varcolacs (large werewolves). You will encounter the first such monster on the way to the reservoir, and the second one - in a side area visited after defeating Moreau. Clashes with werewolves are optional.
The crystal is in a small chest that you will find while exploring the reservoir, specifically after heading out of the Guardhouse towards the Windmills.
You can get this treasure by completing the maze puzzle in the Windmills area. To solve the puzzle, you will need the Mermaid Ball, which you can find in a shrine in the adjacent forest - you can get there only after returning from the reservoir. Use the crank to open the mechanical door.