The first war the world ever knew was so great, so horrific, that nothing could ever compare.
Rumor is it almost killed the I don’t really need to tell you about this place. You live there. If you want pre-history according to the Ever-Dying, you can check Wikipedia. Unfortunately, that won’t tell you the... More, and it’s responsible for the creation of the various parallel worlds the The Seven Peoples of the Earth are the seven identifying types applied to every sentient creature in the world. The Seven Peoples of the World divided themselves in this manner... More occupy.
The last ice age? Due to the war. Earthquakes splitting up continents? Due to the war. The powers at hand spared no consideration for whether the world would survive.