The Old key is an item that can be found in the northwestern room of the Sisterhood Sanctuary, north of Kroy's laboratory, which is locked and inaccessible until his death during Sins of the Father.
It is used to open the large chest found on the 2nd floor[UK]3rd floor[US] of church in Slepe, which gives the player the Elixir of Everlasting, an ancient potion said to be able to extend the drinker's life indefinitely.
- The old key was released alongside Slepe on 24 May 2018, but because Mod West ran out of time to write the text for the item, it was not made obtainable. However, he decided to keep it in the game's code, and teases its role in potential future content alongside the Elixir of everlasting scroll. It was later made obtainable with the Darkmeyer update on 4 June 2020.
- ↑ Jagex. Mod West's Twitter account. 25 May 2018. (Archived from the original on 28 May 2020.) Mod West: "It was a scroll I ran out of time to write. I kept it in as I knew it'd be found by certain players and enjoyed the idea of them searching for it fruitlessly :P Much like the key, it'll play a part in potential future content."