Chimera

Nobody is quite sure how the Chimera came into existance, but what people do know is that they were first spotted, Russia. The harsh climate
actually helps them perform at optimum temperatures and in order to expand their "empire" west across Europe from Russia
they had to develop cooling technology.
With most of Europe conquered, only Britain remained strong. However, after some unorthodox tactics, the Chimera managed to enter the
country and take over the capital city, London. Following the collapse of London, the Chimera altered the climate so it was more
close to the harsh conditions found in Russia and they pushed the
British Armed Forces almost into hiding
as they looked to eradicate all human life on the island.
With the arrival of the American Armed Forces
though, things didn't necessarily go as they had forseen.