Similar to Margit's Shackle sold by Patches, Mohg's Shackle is a tool in Elden Ring used to ease the boss battle with Mohg by temporarily binding the Blood Lord to the ground. Several Tarnished have found even further utility for this tool by using it as a trigger to freeze the Demigod in place, allowing players to cheese the boss of Mohgwyn Palace. However, acquiring the finding the Mohg's Shackle is itself a challenge in Elden Ring, as the item is hidden within the sewer depths beneath Lyendell, Royal Capital.
To get Mohg's Shackle in Elden Ring, Tarnished adventurers must first locate the well that serves as the primary entrance to Subterranean Shunning-Grounds. Starting from the East Capital Rampart Site of Grace, traverse the top of the wall guarded by performing Oracle Envoys. Use the lift in the opposite building to reach ground level and access the main street. Head southwest and turn right to enter the ruined district of the Capital. Be mindful of the Erdtree Avatar that will drop down near the gateway to the neighborhood.
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After resting at the Avenue Balcony Grace site, descend the stairwell on the right. Turn left and jump over the railing and into the courtyard below. In a corner to the north sits a well where Tarnished can enter the city's sewers in Elden Ring. It's recommended that travelers rush to the well quickly as several nearby Albinauric Crawlers will attempt to grab the player.
Continue through the first few sewers tunnels to reach a dark room crawling with Giant Rats. Open the door ahead and turn left, leaping down into a spacious corridor with large grotesque enemies. Enter the room on the first right to find the Underground Roadside Site of
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