War alphas are the eldest, and first, generation of kijikaiaku, personally created by Gaia to cull the humans who were so close to killing their own world, as well as Gaia. From their creation a hidden war ensued, as kiji were sent in secret to drain humans of their essential life force and return it to Gaia’s Core, where the energy could be reused to help heal the planet.
Being made with an intentional lack of empathy, they killed without remorse for many years, whittling the population of humans down drastically as their own numbers grew. With the goal of saving the planet, they were ruthless in their methods.
After the war died down, War Alphas became a lot more peaceful.