Karne

Karne was an agent for the Zhentarim and attempted to gain control of the Onyx Tower for them so that they could be restored to their former glory. Karne controlled the Zhentarim activity in the Western Heartlands/Sword Coast Blend pre-spellplague. In the city of Baldur's Gate he pretended to work for Beholder named Xantam in a thieves guild. After three adventurer's attacked the guild, Karne faked his own death and led to Xantam getting killed. This led to a chain reaction of events that caused the Onyx Tower to crumble, giving the Zhentarim an opportunity to seize it. However, their attempts were frequently foiled by a band of five heroes and the Harpers. In order to gain control of the Onyx Tower, Karne entered the Zhentarim in a temporary alliance with the Harpers. Although planning to betray the Harpers and seize the Onyx Tower, Karne was never given the chance as the Onyx Heart was trapped in the Elemental Foundation of Shadow, which was then sealed.