Cyric commissions the creation of the Cyrinishad. Three hundred and ninety-seven versions were created until Cyric was satisfied. The tome, dubbed "The Book of Lies" by other gods of the pantheon, outlined the "true" history (in Cyric's mind) of the "One True God." But Cyric did not stop there. The Cyrinishad was a magical creation, with the intention that anyone reading the tome would believe the Cyrinishad as truth.
Many gods could not abide by these actions. Mystra, with the help of Oghma (The Binder) and Mask, The Cyrinishad's final version was placed in protective custody, but not before it had been read by Mask. Cyric had gained yet another follower. »
Nightal 27 Fall of Zhentil Keep
Fzoul Chembryl reads aloud from the True Life of Cyric, revealing the dark god's betrayal of his faithful at Zhentil Keep. Xeno Mirrormane, High Priest of Cyric, is struck by powerful divine fire from Mask. The flames devour Xeno, then proceeded to do likewise to the temple of Cyric. Fzoul flees the falling city to Teshwave as Cyric-summoned giants, dragons, and other monsters sack much of Zhentil Keep.
Lord Orgauth had only the small number of troops that hadn't fled the destruction and a few meagre reinforcements from Darkhold. Orgauth died during the siege but a pit fiend named Abarax that had been imprisoned by one of Orgauth's mages escaped from it's bonds and found Orgauth's corpse. The baatezu polymorphed into the fallen leader and effectively took up his life where Orgauth had left it.
Abarax (as Orgauth) and his troops survived. He then summons the Erinyes Eshaeris to take the place of a courtesan named Desmonda who had disappeared during the siege. Together, they befuddled the remaining lords and took complete, unopposed control of the Keep. »
Cyric had sought the soul of Kelemvor Lyonsbane, but was unable to find him. Cyric releases Kezef the Chaos Hound from Pandemonium, and commands it to trace Kelemvor's soul. Kezef ended up being trapped again by Mask.
Kelemvor's soul was trapped in Cyric's sentient sword, Godsbane, actually an aspect of Mask, who planned to steal the portfolio of lies. Mask used Kelemvor's soul to gain the cooperation of Mystra, all the while planning a revolt in the City of Death against Cyric. With the help of Mystra, Torm, Oghma, and Cyric's own high priest Fzoul Chembryl (whose loyalty lay with the dead Bane), great chaos was caused in two of Cyric's most important bases of faith: Zhentil Keep, and the City of Death. A great number of Cyric's follower lost their faith, thus weakening Cyric. In addition, Cyric's nightmare was freed from Dendar the Night Serpent, and the dream found Cyric, causing him to think that Kelemvor had somehow returned to life and to seek revenge. At that moment, Cyric lost his mind, crushed his sword, which freed Kelemvor, and made his nightmare come true. The two fought and Cyric's fear, indecision, and madness caused his defeat, and Kelemvor overthrows Cyric's rule in the City of the Dead. By the wish of all dead spirits and Denizens in the Gray Wastes (some say by Ao's will also), Kelemvor became the new God of Death. Mask also emerged from the sword. Begging for forgiveness as Cyric attempted to salvage what he could of the situation, Mask followed his new master out of the castle. »