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Do You Lose The Skeleton Key After Darkness Returns? [Solved]

The Skeleton Key can be used like a regular lockpick and can be kept indefinitely, provided it’s never returned to the Twilight Sepulcher, during the mission “Darkness Returns.” In addition, the Lockpicking skill will still increase when a lock is opened (removed in patch 1.4, back by 1.9).

The Elder Scrolls V Skyrim - The Skeleton Key

This video shows how to get the

[SKYRIM] Puzzle Guide - Pilgrim’s Path & Returning the Skeleton Key

The final quest of the Thieves Guild was completely unmarked so

Skyrim - “Darkness Returns” Thives Guild ENDING Quest (Nightingale Perks, Nocturnal, Skeleton Key)

Skyrim Gameplay Walkthrough - Thieves Guild Quest Ending Nightingale Perk