Long ago, when the world was still forming, the land we know as Yoshwaing was born from conflicts between the planet itself. During this conflict, 4 figures stand to help make this land grow: Haegsim, the Aku Master of Fire; Neichian, the Aku Master of Nature; Shadoshi, the Aku Master of Shadows; and Lokutus, Aku Masters of Frost. They were given these titles due to how they were born into this world, ravaging, powerful, and destructive demons. And with the Master, comes their creatures that we called Akus, ones that are more wicked than the Aku Masters.
Soon, the four gain their own conscious and embodied their forms after thousands of years. Haegsim became a kind, warm-hearted person who cared for all people who lived on Yoshwaing, his kingdom or area as he calls it, and those who go up to him so he may grant 1 reasonable request. Neichian because a sweet woman who helped the people of her forests learn how to survive, but does not hesitate to kill. Shadoshi was a more moody fellow, who laid in the shadows to wait for the next soul to take. But Lokutus... he is the most souless of them all, only creating death and fear both by his name and his touch. He is know for being the most ruthless during the winter season, as he often murders hundreds so he can claim the land in his kingdom of Ice.
They say that when Haegsim touched his heart, that it melted off of him and became the very emotional Mizui, The Aku master of Water. In fact, Haegsim and Neichian made most of the world today, she created wind and the laid back and relaxed Lengjing, the Aku master of Wind so she could spread the pollen more easily. Though his heat combined with the wind helped form the clouds and lightning, and created the almost always annoyed and a bit of a fooled who annoyed Mizui constantly: Raitoningu, the Aku master of Lightning. The deserts, what bordered between the lands of Nature and Fire, created the Aku master of the Sands that was a trickster and master of illusions, Giman, who was crafted from the molding of fire and stone.
Thousands of years later, Man started appearing in Yoshwaing and started settling in the different areas or now regions of these lands, in hopes to make a living. Since then, there have been many wars between the Aku Masters, mainly of Fire versus Frost, since Frost sometimes did not retreat back into his kingdom once the spring started coming. But, war was not the only thing that harmed the lives of man, but the Akus who were as ravaging as any wild and powerful creatures.
After the destruction of a neighboring village, Yabo Watsinobei traveled from Nature to Fire to beg Haegsim to help. He said to Yabo to "Give him all the metal weapons he carried with him." He did and the Haegsim created the metal that is essential for all Aku Hunters, Pyeonghwa Metal, the only metal that could easily kill only Akus. He left a farmer and returned as a hero with about 40 to 100 men to help slay the Akus and Deliver the metal to Man.
Now, the land of Yoshwaing is calmer before than in the past, as the Aku Masters are more accepting of man than ever before, excluding some of them, and the Akus have been less threatning since the Metal was brought to us.