The Stone of Jas plug is a reward for pulling the plug in an aquarium at least two times. Its appearance resembles the Stone of Jas.
Placing the Stone of Jas plug is necessary to complete the construction achievement Wen Mah Aquarium Jas Got a Bik too Ful. If you already had the Stone of Jas plug when this achievement was released, it can be completed by removing the plug in build mode, then placing it again.
- The examine information is a reference to the Elder Gods' creation and use of the Stone of Jas to herald the "new era" of Gielinor.