|Release date||25 June 2015 (Update)|
|Alchemy||Cannot be alchemised|
|Store price||Not sold|
|A disconcertingly purple egg.|
The Rotten egg is an item available only to Jagex Moderators, similar to the rotten potato. It is unknown what its function is, but is assumed to be used for testing features on the Old School RuneScape servers.
It is found to have several right-click options, of which their function is unknown: