Diadem of Maunstraut is the first full-length English fan game made with Sword of Moonlight: The King's Field Making Tool. The game has a concept similar to the traditional King's Field games (and other games of the series) as well as its own original soundtrack.
This is a first person action-RPG in which you start out with very little, but through exploration and dealing with the right people you'll gain access to powerful melee weapons, various equipment, numerous items and potent spells; all in the attempt to destroy the source of evil in the land of Maunstraut. The game has a dark medieval atmosphere, a traditional RPG level gaining system and many dangerous enemies to encounter.