The dungeon levels are detailed in Dungeon #112, as well as in Wikipedia @ https://en.wikipedia.org/wiki/Maure_Castle
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As detailed in fragments Afelbain's Diary (in Dungeon #112, pages 88–89), the following additional levels exist below Maure Castle: 2nd The Retreat, 3rd Old Laboratories and Testing Chambers, 4th Dark Tunnels, 5th Old Dungeon, 6th Chambers of Antiquities, 7th The Statuary, 8th The Greater Halls, 9th The Family Crypts, 10th The Reliquary, 11th The Outer Sanctum, 12th The Treasury, 13th The Old Caves, 14th Elluvia's Pit, 15th Warlock's Walk, 16th The Cells, 17th The Furnaces, 18th Our Master's Level.[2]
Additional information about the Maure Castle dungeon levels is also revealed in James Jacobs' "Demonomicon of Iggwilv" article on Malcanthet in Dragon #353 (Elluvia's Pit is specifically mentioned).[7]
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I don't believe that we know much about the upper works/castle levels of Maure Castle itself, though. I did adventure in Castle El Raja Key in 2007, but it's not necessarily the same as MC, either. I don't recall if there's any additional info in the El Raja Key Archive on MC upper works, but it's worth checking if you've got a copy: http://www.tlbgames.com/collections/archive
Allan.
