The Citadel of Thunder

The Citadel of Thunder: Arduin Dungeon Number Three was published in 1979 and was the third standalone dungeon module written by David A. Hargrave, based upon his previously published gaming system known as Arduin.

Other Arduin modules
Listed in order of appearance:

Caliban: Arduin Dungeon Number One

The Howling Tower: Arduin Dungeon Number Two

Death Heart: Arduin Dungeon Number Four