ECG
The fortress of Taer Sadaen was raised by the Aereni who settled these lands 10,000 years ago. According to legend, the citadel was the site of a terrible battle between goblins and elves shortly before those ancient settlers returned to Aerenal. The ruins of Taer Sadaen have never been found, and some say that the fortress was shifted out of the world by a powerful elven curse. When the stars and moons properly align, Taer Sadaen is said to reappear with that ancient battle still raging around its walls.
PCs traveling in Valenar might find themselves in the right place at the right time when the fortress crosses back into the mortal realm. Or, interests in Aerenal or the Five Nations might have information that points to the location of the fortress—and reasons for the PCs to find it before the Valaes Tairn does
ECS
This fortress, built during the Age of Monsters, was the site of a terrible fi nal battle between the elves and hobgoblins. The ruins have never been found. A powerful elven curse pulled the fortress out of time, and when the stars and the rings of Siberys align, Taer Sadaen reappears for a night, the battle still raging.