It was the Subject Reversed Stone. This stone looked exactly like Jon's previous stone, but it has a difference. Whenever it is used on someone else, the user will accidentally say their own name instead, and whenever it is used on the user, they will accidentally say domeone else's name For instance, if you wish that someone else has red hair, it will give you red hair, and if you wish to have red hair it will give it someone else. A wish that someone becomes your slave will be interpreted as a wish that you become your own slave, which will probably just fail unless the stone figures out a way to do it.
Jon wokeup and picked up the stone not realizing it wasn't his stone
