By Anders Sandberg
Level three talisman
This is a simple ring, consisting of a single band of gold twisted a half-turn before joining itself. If the wearer twists it on his finger, he will immediately (and vulgarly) vanish into a kind of pocket dimension, a kind of Correspondence Paradox realm. Everything is as before, but its own mirror image and without any other people. Another twist of the ring, and the wearer is back in reality again. The ring unfortunately has a drawback -- when used too often the mage begins to slip between the worlds more and more, even when he doesn't want to, and finally ends up completely imprisoned within the realm when the ring suddenly shifts without him.