User blog comment:Ravager134K/my theory on the origin of the chimera/@comment-74.132.101.157-20100412215910

I think that the pure Chimera were the only kind of Chimera in existence until they decided to infect other planets or another race on the same planet. The different species and possible impurities in the original conversion process resulted in separate strains that the pure Chimera could control. The spread of the virus escalated as the pure Chimera grew greedier and greedier for power. Another alien race got involved with the Chimeran War to defend their home or to battle with their empire for absolute power. The other race established a base on what would be known as the Chickxlub Crater on Earth to increase their forces and/or to find sanctuary. The Chimera launched an interplanetary spire to wipe the other race out. The spire either hit a reactor or power source or the base self-destructed and resulted in a massive explosion that killed everything in the base, including the crawlers from the spire and created the crater itself. The pure Chimera thought that Earth was not worth taking over because of the lack of viral hosts until they noticed the human race. They launched an interplanetary spire that resulted in the Tungusta Event and the infection of the human race due to the fact that the crawlers were not destroyed. The spire's remains were likely buried in the crater due to the explosion and/or a natural process. The interplanetary spires also had (have) extremely valuable and important Gray Tech. The Chimera retrieved the spire in Russia. Under the leadership of Daedalus, the Chimera attempted to retrieve the other spire but were at least temporarily thwarted by the Sentinels. The pure Chimera still operate(d) on their own planet(s) and possibly Earth as well.