Included on one of the disks from Micro-Fantasy Magazine.
Published as a type-in game for C64 in the book Castles & Kingdoms by Virgin Books, 1984. The Commodore port was by Andrew Swanson.
A version of the game is included on several European PD compilations as Balrog of Triad.
The story continues in The Fortress at Time's End.
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Looking at the aka titles, I'm intrigued... how does a fortress seek revenge? Throwing its walls at someone?