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The player characters explore the haunted mansion of the Amber family, and encounter new monsters such as the brain collector. The module is described as a medium to high-level scenario which takes place in a castle surrounded by a strange gray mist.
During their night's rest on their way to Glantri, the player characters are unexpectedly drawn into a large castle surrounded by an impenetrable, deadly mist. This is the result of a curse the wizard-noble Stephen Amber (Etienne d'Amberville) put on his treacherous relatives for murdering him.
The only way to escape Castle Amber (or Château d'Amberville) is to explore the castle, putting up with the demented and at times insane members of the d'Amberville family and the other, often hostile, denizens, and open a hidden portal to the wilderness of the world of Averoigne, where the party can find the means to reach the inter-dimensional tomb in which Stephen Amber rests, in order to break the curse and return home.
In this world, magic is frowned upon, and spellcasters may come to the attention of the Inquisition.
Castle Amber was the second module designed for use with the D&D Expert Set. It was written by Tom Moldvay and published 1981 as a thirty two page booklet with an outer folder and a cover designed by Erol Otus.
The module was developed by Dave Cook, Allen Hammack, Kevin Hendryx, Harold Johnson, Tom Moldvay, and Jon Pickens, and edited by Harold Johnson, Edward Sollers, and Steve Winter. It features art by Jim Holloway, Harry Quinn, Jim Roslof, Stephen D. Sullivan, and Erol Otus.
Mark of Amber was a sequel/remake of the original Castle Amber. It was reprinted in 1995 in the form of a boxed set, complete with an audio CD, map posters, and player handouts. It was part of the short lived Masters series. The Castle was renamed Château Sylaire.