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 Grotworm Lair is located in the caves north-west of the Port Sarim lodestone. The lair has three levels, containing creatures of levels 28, 63 and 98 respectively. They are assigned by slayer masters. Many special drops can be found here, such as bolts for the Coral crossbow and Royal dragonhide.