Varimathras is a Dreadlord who once served the Burning Legion with his brothers Balnazzar and Detheroc. He was clever, manipulative and a very dangerous enemy.
Varimathras and his brothers once attempted to kill Arthas Menethil with the help of Sylvanas Windrunner but their plan failed.
Sylvanas eventually turned against the Dreadlords and attacked Varimathras first. She spared his life in exchange for his loyalty and knowledge which would help her defeat the other Dreadlords. With their victory they rule a large majority of the kingdom of Lordaeron. Their army was renamed the Forsaken; undead who broke away from the Scourge and no longer serve the Lich King.
In Warcraft III: The Frozen Throne he was voiced by Paul Eiding. In World of Warcraft: Wrath of the Lich King he is voiced by Jaimeson Price.