The Ring of Void, from Homestuck! The design is nearly identical to the Ring of Orbs No-Fold, but their is a Void symbol cut into the inside of the ring. The idea is that the rings will leave a small void symbol on your finger since it will press down on the rest of your finger, but not that space. I am not sure if that will work.
There is nothing that you have to do once you have the ring.
I believe this is sufficiently my design for me to sell it, although downloads are still available. Of course, Homestuck belongs to Andrew Hussie, not me.