Battle of the Gods

The Battle of the Gods was a conflict between the Untheric and Mulhorandi pantheons against the Orc pantheon, that happened in -1071 DR as part of the Orcgate Wars.

History
During the Orcgate Wars, the gray orcs and their clerics had developed amazingly powerful and deadly spells; the most potent of magics being their ability to directly call down avatars of their deities. When the orcs invaded Mulhorand and Unther, the gods of those nations also sent their avatars to face the invaders' gods, resulting in what was later known as the Battle of the Gods.

Ill-prepared to defend against the orc hordes, however, the gods of Mulhorand and Unther were slaugthered. Ra was the first to fall, slain by Gruumsh, with several more powers of the Untheric pantheon following: Girru, Ki, Inanna, Nanna-Sin, Nergal and Utu were killed by the orc deities. Tiamat, who was also the enemy of the other Untheric gods, saw an opportunity to slay Gilgeam while he was battling Ilneval. However, Marduk (Bahamut's Untheric aspect) intercepted her before she could act and in the ensuing battle they killed each other in what is known of one of the climactic battles of the Dragonfall War.

Despite their initial advantage, the orcs and their deities were eventually defeated by the survivors of the Mulhorandi and Untheric pantheons in -1069 DR.

Aftermath
Gilgeam became the remaining god-king of Unther. In time, he became more and more tyrannical, making the Untherite to turn to the worship of Tiamat for succor and eventually allowing her to return to Toril in her aspect of the Dark Lady.