The Gate Keeper was a guard/overseer in a catacomb in the Fractured Peaks, one apparently built and operated by the Cathedral of Light.
By 1336, the Keeper was long dead, and had been raised as an undead skeleton. He was put to rest by the Wanderer and his key taken. However, what he had been guarding in life and death was a mystery lost to time.[1][2]
In-game[]
The Gate Keeper is a super unique skeleton in Diablo IV. He is fought in the Defiled Catacomb dungeon. Killing him drops the Catacomb Key.