Mephisto, Lord of Hatred

Mephisto is a character in the Diablo series known as the Lord of Hatred and is described as the eldest of the three brothers (the others being Diablo and Baal).

Mephisto was originally captured by the Horadrim in the deserts near the city of Lut Gholein, the same place where Baal was captured. He was imprisoned inside a soulstone, moved to Kurast and was kept locked inside the Guardian Tower beneath the city of Travincal. His corruption of the regional priesthood led to his release. He was eventually defeated by the pursuing adventurer and his soulstone was subsequently destroyed. He is the most intensely evil brother, whose greatest weapon is his victim's irrational hatred. Among his underlings, the undead compose the vast majority.