Ghaulathator

Ghaulathator, also known as Wintercloak, was an ancient white dragon slain in the time of Netheril.

History
In 3426 NY (−433 DR), Wintercloak flew under the floating city of Lathery, over the Narrow Sea in Netheril, and was teleported into one of the city's cold storage chambers, as part of its fishing system. Wintercloak tore himself free and broke out into the city streets, and there was confronted by Veridon and the city's arcanists. Wintercloak slayed Veridon and a dozen arcanists with its icy breath, but was slain by the survivors.