The stone he put in its place looked almost exactly like Jon's stone, but it wasn't. Sure, it worked in every way like the original stone, but anyone who held the rock would find themselves under an unusual affliction.
For whenever they held this stone in their grasp, the bearer would find themselves extremely submissive, but only to men. They would feel compelled to do anything a man tells them to do. This was the Concubine's Stone.
