War is never pretty
The world of Tellene, like all other places, did not always exist. It is believed that the Creator, a being of enormous power and intellect, developed the universe for her own amusement. Finding the newly created cosmos wondrous yet unsatisfying, she brought forth from her fingertips life forms to inhabit the various planes of existence.
A total of fifty-four gods, each portraying a specific characteristic or related characteristics of the Creator, from life and truth to death and deceit, were brought into existence to govern the cosmos under the watchful eye of the Creator. In order to serve the needs of her children, she also fabricated various species of creatures: dragons, dwarves, elves, primitive races, insects and all creatures in-between. The gods gathered periodically to discuss the state of events on their different planes and the Creator assigned further responsibilities. This system worked effectively for many eons.
However, intelligent individuals, especially gods, are prone to feel indignant toward authority and the limitations that come with being inferior; and the chaotic gods began to resent the control the Creator had over them. It was with this in mind that several deities, led by the Confuser of Ways, formed a plan for the demise of the Supreme One.
The plan succeded, Supreme One was destroyed and her essence to be trapped in a crystal shard. Shortly thereafter, the Corruptor and the Confuser of Ways found evidence linking the Overlord to the death of the Creator. This situation infuriated the good deities, who immediately formed a coalition to bring the flabbergasted Overlord to justice.
With the Creator absent, opposing gods immediately tried to destroy one another; law fought chaos, good fought evil and the neutral gods tried to hold the cosmos together. The ensuing mayhem shook the planes and resulted in the death of eleven deities. However, just as the Overlord was about to be the next god slain, the Lord of Silver Linings called upon the Riftmaster to magically whisk the Overlord away into captivity on Tellene. All other deities believed him to be dead (a belief proven untrue when a human scouting party unwittingly released him from imprisonment).
The conflict continued until a wondrous evolution took place. To the delight of the gods, various races, including humans, began to evolve on Tellene. The attention of the deities was quickly diverted to Tellene. They watched in wonder and amusement as the rapidly advancing races spread their influence across the planet.