"It was once known as 'Yassa Massa' but now it is 'Spirit Mastery'. Whatever you call it, whoever makes use of this invasive magic opens wide the Doors of Possibility...
What would you do if you stumbled across a ring that let you inside others' heads, let you be the puppet master pulling their strings?
Let's find out, shall we? The city of Caethaph't is hardly law-abiding so it is a lucky break that the ring lies there to be taken by any ambitious, amoral adventurer..."