Ebulon

Ebulon was a demon lord who rose to power fighting in the armies of Graz'zt and eventually became a general in the Dark Prince's service before Graz'zt had even conquered Azzagrat. However, Ebulon was defeated during a battle against Demogorgon, who dumped his barely-living body into a pool in the Wells of Darkness with the intention of using Ebulon as a tool against Graz'zt, a plan he soon forgot after stationing a maelephant as the pool's sole guard. Graz'zt, on his part, sought to rescue Ebulon out of a sense best described as loyalty, although Ebulon himself resented the long imprisonment and knew many secrets of Graz'zt's past that could be used against the demon prince.