Lethchauntos

Lethchauntos the Black was a powerful and evil mage  active in the Sword Coast as of the 10 century DR.

History
At some point prior to the, Lethchauntos travelled to live among the orcs of Uruth Ukrypt, led by the shaman Wund. While there, he crafted the Ettin Axe of Uruth as a gift to the orcish realm's first king, Uruth, and at some point he parlayed with the sage Orfidel. He was believed to be one of the first known owners of The Nathlum, a tome of poisons and evil magic, although he lost possession of the book during the Orcfastings War of 936 DR.