https://wccftech.com/resident-evil-village-guide-how-to-complete-the-treasure-map-in-castle-dimitrescu/

After you’ve explored what you assume must be most of Castle Dimitrescu in Resident Evil Village, there’s a chance you’ll come across a torn treasure map. This map leads you back down through the kitchen you first explored beyond the Maroon Eye Door, but the odds are you haven’t been back there since.

This guide will walk you through everything you need to know about the treasure map, the Special Chambers, and the treasure within.