Secluded Shire of the Artificer

Secluded Shire of the Artificer was once a temple to the Druidic god as well as a portal to he Fey Wild. But as the world changed so did the temple. This new concept of 'Science' started to work its way into the use of Magic. Soon the young Druids were inventing machines that were a complicated replacements to everyday magics. This cause a rift between the younger Druid and the Elders and a compromise was reached. Mixing Magic with Science, mixing machines with spells and potions and such. For a while this worked out great. But the Druids were ultimately mixing gas with fire. And one day, one of the experiments went completely sideways. The heat from the gears of the machine interfered with the magical components of a teleportation device they were working on. Once critical mass was reach an explosion of magical energy rushed out of the temple enveloping the town and filling the valley where the Shire resided. The portal to the Fey Wild was destroyed and a think dense fog surrounded the valley. No one who entered the fog returned. Soon people stopped trying. There is a rumor that every 50 years or so a robbed stranger can be seen in the edge of the Fog.

Adventures are eager to find the Secluded Shrine of the Artificer as it the only known place to have successfully married Machine and Magic. But it is known that the Shire can only be visited once every 50 years. And you must be lead by one of the Druids who had left just after the explosion or someone they trained. The fog may be thin enough to travel thru but is still quite dangerous. These Druids are the only ones who know when the fog will be thin enough to travel.
https://dungeonmasterblock.freeforums.net/thread/1642/dm-nastics-87-journey-destination