The Skeleton Key is one of the Daedric Artifacts you can obtain in The Elder Scrolls IV: Oblivion, and serves as an unbreakable Lockpick. It is rewarded by completing the Nocturnal Daedric Shrine ...
They’re DMZ’s master keys. They open any lock for any location, whether that’s a bag, cache or crate. If you have one, keep it safe because it’s an incredibly powerful tool for looting and exploring.