Not long into your adventure into Resident Evil Village, you meet a traveling merchant known as the Duke who sells a variety of items. The friendly salesman soon also provides you with a map of special treasure chests scattered throughout the area that take a little extra effort to unlock. These chests have some of the most valuable items in the game, including weapons and key upgrade items for your guns, and some contain a few of the most valuable treasures in the game, which you can sell to the Duke for cash.
Unlocking all the treasure chests in the game takes a little extra effort as you explore, you should definitely make that effort. You'll find two of the game's most powerful weapons in these chests--the magnum and the grenade launcher. You'll also uncover a key upgrade for the sniper rifle and several treasures that you can use to fill up your wallet. Here's where (and when) you can get to each of the chests, what they contain, and how to nab them.
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Return to the village and head to the Maestro's House on the south side of the middle section. You might have seen this house earlier when you were investigating the house with the red chimney; it has what looks like a violin on the door. Use the Luthier's Key on the door to open it. In the back of the house, you'll find an armoire with a combination padlock on it. Scour the house to discover the combination on your own, or just enter 27-09-17 to open it.
Inside is the Maestro's Collection treasure, which consists of the F2 Sniper Rifle's High-Capacity Magazine--a significant upgrade to the gun--and the Steel Hraesvelgr statue, which you can sell to the Duke for a significant sum of Lei.
Head back to the village proper and go to the graveyard near the gate to Castle Dimitrescu. You should find that a small crypt that was previously locked is now open. Look inside to find the Broken Slab item; the other half of the name from the Beneviento grave.
Return to the grave near the Beneviento house, but note that you won't be alone when you arrive. Use the Broken Slab on it and it'll open, revealing Berengario's Chalice, a treasure you can sell to the Duke.
Examine the necklace to reveal a crystal set into the little skull that you can remove (and, later, sell). Beneath that is another surprise you can find while examining--Luiza's Key. Grab it and then head back to the Altar location where you found the Duke. Head west toward the ceremony site. Along the way on the left and right sides of the path are caves with frescoes painted inside.
Check the one on the left for a small box and use Luiza's Key to open it. Inside is Cesare's Goblet, another treasure you can unload with the Duke.
As you're making your way through this area, you'll see the creek running through this section of the town. You'll need to make your way down to it and head left, following the water north toward the building with the water wheel. It's locked, but you can open it with the Iron Insignia Key you got inside Castle Dimitrescu. You should have found it by completing the piano puzzle.
The tough part about reaching this treasure isn't figuring out a puzzle, but dealing with the creature that guards it. Try to sneak past it using stealth and get to the waterwheel house. Inside, you'll find the Grenade Launcher--perfect for dispatching a large, nigh-unstoppable wolf.
Follow the path to the end and you'll find the most intact building in the area up a small hill. It's locked, but you can slip through a small hole in the back to get inside. Kill the lycan you find there and open up the treasure chest to find one of the best weapons in the game, the M1851 Wolfsbane Magnum.
Good news: You'll have occasion to try it out as soon as you find it.
Take the river north. You'll hit another dock before long, which puts you in front of a big door that leads back under Castle Dimitrescu. Follow the path until you're in a room with another of those lantern puzzles, where you have to swing a brazier to light two other torches. Use your gun to make the swings pretty easy, opening first the left door and then the right to plunder everything. You'll see one more torch in the next room, however, that you can't reach by swinging the brazier.
Luckily, an endless supply of ghouls will crawl into the area from the room on the right. Lure one out into the main area and nail it with the brazier to light it on fire. Then goad it into following you into the next room and trick it into running into the torch there. That'll light the torch and open the door beyond, which lets you snag the Golden Lady Statue treasure, which you can then sell to the Duke.
Cross the stream, break open the lock on the gate, and continue inside. You'll have a fight on your hands in the mill proper, but once you've completed it, you can ransack the place. Shoot the three locks off the big red door and you'll find a room filled with a huge amount of spare meat, which you can cart off to the Duke for a decent price if you don't need it for cooking.
Keep following the path through the building and you'll eventually come across a small atlar with a treasure chest on it, which contains the Father Nichola's Angel treasure for you to sell to the Duke.
Just beyond the crystals is the final treasure, Guglielmo's Plate--another one to sell to the Duke for a hefty profit.
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Guides Roundup Resident Evil Village Walkthrough (Spoiler-Free) Essential Beginner's Tips & Tricks + Show More Resident Evil Guides & News Links (3) Boss Fight Guide Treasure Chests Guide - Every Marked Treasure, Weapon, And Upgrade On The Map Food Guide - Where To Find All Ingredients