Moreau's Hidden Weapon is one of the treasure locations the Duke scribbles on Ethan's map in Resident Evil Village. The mysterious weapon itself is the M1851 Wolfsbane, one of the most powerful magnum revolvers the player finds in Resident Evil Village.
Players must first find the Crank to unlock the gate that prevents players from entering the area where Moreau's Hidden Weapon is located. The Crank is a story-specific item that all players will pick up during a chase sequence with Moreau. This item is impossible to miss, so players should return to the locked gate after defeating the Moreau boss.
After unlocking the gate, players will enter a small closed-off section with three houses. Inside the houses are zombies playing dead, so dispatch them before they cause any harm. There are also flying Samca's in here, which can be easily killed with your sniper or shotgun if they fly in close.
Moreau's Hidden Weapon is found within the third house, or the farthest hut within this area. The front door is locked, so creep behind the back and crawl through a hole in the wall to enter. A lycan will be inside waiting, so it's best to have the shotgun equipped. The M1851 Wolfsbane rests inside of a small chest.
Not convinced by the M1851 Wolfsbane's powerful stats? Don't worry, because a Varcolac/werewolf waits for you outside! Might as well test out your new revolver and lay waste to the Varcolac. What once required explosives should only take one to two shots with Moreau's Hidden Weapon on Normal.
For more Resident Evil Village guides, check out All Crafting Recipes in Resident Evil Village and How to get and combine the Azure Eye in Resident Evil Village on Pro Game Guides.