Master Emerald

The Master Emerald is essentially the plot mcguffin of Rougher Than The Sword. Lord Knux's job is to protect this emerald. The Master Emerald has the ability to grant anyone's wish due to it's sheer power. Due to that, the Sword Artists want to claim it in order to control the whole Earth below and vanquish it with negativety. Throughout the whole story, the Master Emerald sits in the center of the Emerald Shrine on Angel Island, keeping it floating in the sky. At the end though, the Sword Artists manage to steal the emerald, and the Emerald Guardians must take it back.