Raid on Nightmare Castle

Endless Quest #14 From the back of the book: You are Kyol, a young Cleric about to set off on an important mission to dreaded Nightmare Castle. Will you be able to defeat the evil warlord Rorlis and rescue his captive, the brave elven rule Estragon? The paths you may take are many, and the choices are yours! Will you enlist the aid of the great magician Canos, even though his powers have been diminished through injury? Or will you take the magical Jewel of Kaibak he offers you, knowing that you may not have the courage to use its mind-destroying power against the monsters that guard the castle?