The Eruption of Mount Hotenow
Geological / environmental event
Circa 1451 DR, Year of Knowledge Unearthed
The volcano known as Mount Hotenow erupts due to the awakening of an ancient fire primordial, devastating much of the surround area, including Neverwinter and Luskan. Its effects are still very much visible today.
https://forgottenrealms.fandom.com/wiki/Mount_Hotenow
