This is a concept I created for what the ruined city of Starmantle looks like. I painted this as a personal project.

Description from the wiki:
"In the mid-to-late 14th century DR, Starmantle was inundated by flood of Shou humans from Thesk.
Starmantle was destroyed in 1385 DR by the Spellplague and, just over a decade later, the city was little more than ruins. Large, man-sized, gemstone-hard, emerald-colored outcrops that hummed with a single flute-like note covered the ruins and the surrounding land. A flickering blue glow passed between the outcrops. Obsidian masses slowly drifted across the open ground. The only inhabitants were plaguechanged ghouls."
https://forgottenrealms.fandom.com/wiki/Starmantle