Elden Ring: How to Get Unlimited Smithing Stones 3 & 4

gamerant.com:

After upgrading an armament in Elden Ring to +6, players will no longer be able to use Smithing Stone [2] to improve the weapon. Instead, these fans will need to spend Smithing Stone [3], and later Smithing Stone [4], to increase the armament's offensive power. Fortunately, it is possible to purchase an unlimited number of Smithing Stones 3 and 4 in Elden Ring, and this guide will detail exactly how that is done.

Players that are interested in buying Elden Ring's Smithing Stones 3 and 4 should focus their efforts on obtaining the Smithing-Stone Miner's Bell Bearing [2]. This key item can be found in a chest inside the Sealed Tunnel, an optional dungeon in the Atlus Plateau region. To reach the Sealed Tunnel, fans should navigate to the cliff that is just east of the Outer Wall Phantom Tree Site of Grace, descend into the southern pool of water, and continue south until they encounter an entrance that is marked with a brazier.

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Players should now pass through that entrance and follow the path to reach a room with yet another Elden Ring Site of Grace in it. This room is also home to a burning brazier, and there is a cracked wall just to its left. This is not a typical wall, though, and fans should hit it to reveal a path that leads directly into the Sealed Tunnel.

At this point, players should continue forward until they run into a wall and an enemy, turn to the left, and smash the barrels and cart that block their way. Elden Ring fans should then continue forward, and they will see a chest on their right after taking just a few steps. This chest contains the Smithing-Stone Miner's Bell Bearing [2], and it is worth noting that there another illusory wall behind the