The fortress remained sealed for centuries, keeping the evil within trapped inside. The spell was meant to hold forever. But there are always people who will do something regardless of the dangers, simply because it is forbidden.
Worse, rumors of the treasure buried in the darkness spread almost before the wards were laid. It was inevitable that someone would break that seal and sneak in, releasing ancient horrors on unsuspecting people.
Fortunately, germ theory had progressed significantly in the interval. The sages of the present were able to quickly isolate and treat the plague before it did too much harm.

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