Graz'zt

Graz'zt the Seductive, the Demon Prince of Indulgence, is one of the most powerful demons in the Abyss. He rules over three layers, known as the domain of Azzatar. He is able to telepathically communicate via his sword, which he left behind in the Umbra Hills of Exandria, with its wielder. With the help of deception and guile, Graz'zt has gathered a following that gives him the status of a lesser idol.

Personality
Graz'zt's still longs for revenge against the Tal'Dorei Council for his defeat in the Battle of the Umbra Hills centuries earlier, and hopes to deceive some warrior into bringing about the Council's downfall.

Biography
According to Cobalt Soul records, Obann was once Graz'zt's Master of Wills, but was shamed and destroyed after a terrible failure to his lord. However, Obann was roaming Exandria as late as 836 PD, at which point he was unwittingly serving Tharizdun.

During the Calamity, Graz'zt presumably held a seat at the temple of the Betrayer's Rise with the other Demon Princes.

Scattered War
Several centuries later during the Scattered War, King Trist Drassig and his army were forced back to the Cliffkeep Mountains after losing multiple battles to the young warrior Zan Tal'Dorei and her rebels. Obsessed over the possibility of losing, Trist pledged his service to the Demon Prince of Indulgence in exchange for the power to smite his foes. Graz'zt accepted the deal and sent his demonic forces to the valley, which became a bastion of his influence.

Drassig's army and his new fiendish allies spilled into the Emerald Highlands (the hills south of the valley) "like a river of nightmares." Zan and her rebels fought in the Battle of the Umbra Hills with the help of the elves of Syngorn and slew Trist, thereby ending the Abyssal pact and the Drassig bloodline. With the pact severed, Graz'zt and his forces were defeated and banished back to the Abyss.

Aftermath of the war
The large amount of blood and demonic ichor spilled on the battlefield caused the grass and flowers of the Highlands grow black and burnt, giving the formerly-verdant area the new moniker "the Umbra Hills." Similarly, energies released in the battle left the trees in the valley to the north dead and petrified; that area would come to be known as the Grey Valley.

In 812 PD, as a part of the hook called Shadows of the Past, shadow demons are still drawn to ancient Drassig war camps by the contract between Drassig and the Graz'zt. By 836 PD, the demons are gone.

Graz'tchar, the Decadent End, was lost during the Battle of the Umbra Hills. This blade of the demon prince provides a telepathic connection with Graz'zt, calling from the Grey Valley for a new wielder.