History of the World
Not long after the banishment of the deities to the prime material realm, it did not take long for the gods to continue their fighting. Each god blames the other for being banished by the Overlord and resorting to violence. The battles between the deities grew fierce and unrelenting, destroying everything in their wake. The inhabitants were caught in the middle of the war that was destroying their lands, with towns reduced to rubble and ash and forests burned to the ground.
People started to fight back in any way they could to protect their land. This is when a group of powerful sorcerers showed up and took the deities head-on.
The newly found rivals of the gods proved to be immensely powerful and forced the deities to work together to stay alive. Many battles and many years would pass with no end in sight. Mystra, mother of magic, was one of the gods that fell, and her death caused The Weave to come undone, leaving the world without magic for a time until her replacement was ascended. This is when, on both sides of the war, the fighting stopped, for their strength came from the use of magic, and without it they were powerless.
When a new goddess ascended as the new mother of magic, she materialized in the realm of the gods, for it was post-banishment. She took the name Mystra in honor of the fallen goddess and restored the weave and amplified the magic of the gods in the material realm. This gave them the upper hand in the war and allowed them to bring an end to the conflict.
After the war, the gods reflected on their status as deities and started appreciating the power they had been granted by Sohla and their followers. This prompted Sohla to restore the balance and allowed the gods to return to the realm of the gods.