Evolutionary arms race

The "Arms Race of Evolution" is a euphemism for the evolutionary competition between two previously-cooperative species. It began on a distant planet, eons ago. One species resembled an Earth frog, and one an Earth snake. They originally cooperated to get food and survive, but eventually, the frog evolved to eat the snake while the snake evolved defences against the frog, and later began to eat them. One of them evolved into the Dark Ones, and the other evolved into the Encyclopods. The Dark Ones preyed on all life, making many species extinct, while the Encyclopods defended all life, and fought with the Dark Ones. Eventually, the life giving Chi receded, which killed most of the Dark Ones, and Encyclopods.

The war ended when the last Dark One (Leo Wong exterminated all the others) was killed by the last Encyclopod, which was hatched from the Violet Dwarf Star.

Additional Info

 * The earlier evolutions that occurred include:
 * The frog evolving to eat the snake while it were standing on the frog to get to the fruit.
 * The snake inflating itself to not fit in the frog's mouth and to crush the frog.
 * The frog growing a sharp limb, which it used to deflate the inflated snake.
 * The snake gaining an armor-like hide which it could activate and deactivate at will, which was impenetrable to the frog's sharp limb. It also was able to turn itself inside out and devour the frog.
 * Strangely, the Arms Race of Evolution was originally two species evolving to get food, without any moral or ethnical implications. It is possible that as the snakes or the frogs evolved, they gained sentient minds, and were able to have opinions.