The Cistern of the Three-Eyed Dwarves

From the publishers blurb:

At the eastern edge of the empire of the ashen sky lie the redwater mountains and the small town of Graycoast.

A few weeks back strange things started to happen in the region.

Now the smallfolk is frightened and the gentry is worried to say the least. Lightning strikes unaturally often, sometimes even from a clear sky, people have strange dreams and all metal seems to be charged, throwing sparks at the slightest touch. There have even been reports of wild magnetism around the town!

The case is clear for the rulers of Graycoast:
Someone or something is using the heretical forces of electricity.

A 20 room dungeon with a small wilderness part for a party of level 2 to 4 awaits you.