Vardon-Kosnax War

The Vardon-Kosnax War was a war that took place 140,000,000 years ago between the Vardon race and the Kosnax race.

The planet Xeriphas was caught in the crossfire of the war, and radiation devestated the planet, poisoning the Xeraphin who inhabited. The Xeraphin merged into a gestalt intelligence and and traveled in a ship to Earth, which at the time, was nearing the end of its Jurassic Period. (DW: Time-Flight)

The outcome or anything else about the war is unknown.