Heat lightning can also occur if cloud-to-ground lightning occurs very far away and the sound dissipates before it reaches the observer. At night, it is possible to see the flashes of lightning from very far distances, up to 100 miles, but the sound does not carry that far.
Fungal Grotto is a 4-man dungeon in Elder Scrolls Online. It is located all the way at the western edge of Stonefalls.
The Grotto is an expansion to the ranch set inside a (slightly spooky) cave. The Overgrowth is an expansion to the ranch that is covered in moss and tall grasses. Lab is an expansion to the ranch, opened the Slime Science. Docks is an expansion to the ranch (opening in 0.5.1).