The Chronicle of TTT in the Age of Worms

Prior to the Dawn War, the Wind Dukes became some of the earliest practitioners of elemental magic. Beginning as elementalists of air and lightning, they eventually mastered other elements and as their mastery of the elements grew, dozens of lawful races and elementals swore fealty to them, such as djinn, inevitables, and salamanders. At its peak their empire comprised most of the elemental planes, uniting them under one rule, as well as several worlds on the Prime Material plane

According to legend, Kyuss was an extremely powerful and a charismatic prophet in Mezro led his cult out of that city in −653 DR after persecution from the mainstream followers of Ubtao. His birth name is unknown, though recent records suggest he was nicknamed "Underfoot" in his youth.   Kyuss and his followers founded the religious city of Kuluth-Mar in the Chultengar. His cultists discovered ancient metal plates that foretold the future and confirmed every prophecy that Kyuss had ever made. Kyuss was personally visited by his god, Jergal, who gave him a gift of a single green worm and tutored the man in the ways of necromancy[7]   He began experimenting on the undead, creating such horrors as the Kyuss Worm, the Spawn of Kyuss, and the Avolakia. At this time, he gained the services of the black dragon, Dragotha, who he transformed into a dracolich to serve as his general of his undead host. He created a cult around the dogma of life being only temporary, the afterlife a lie, and undeath being the one true path to immortality.   While his cultists grew ever more devoted by the apparent truth of his visions, Kyuss tried to fulfill the greatest of his prophecies. He sacrificed powerful magic items and built a massive citadel, the Spire of Long Shadows. At the top of the Spire, he created a monolith through which he channeled the terror, adulation and souls of his entire cult and achieved apotheosis.   However, an alliance of couatls, eladrin, wild dwarves, and druids trapped him in the monolith, which prevented him from ascending to true godhood and relegated him to a historical footnote.

The Sembian armies of Netheril marched on the Dalelands, conquering Archendale. The Sembians then blocked the road between Daerlun and Cormyr and massed all along the borders of the Dalelands. This led Cormyr to send an army to protect the Dalesfolk.