In ancient times, the grass and tree Yuanling tribe was born from the "core of life", and humans awakened wisdom in chaos. In order to resist the "monster tide" (large-scale invasion of the mainland's native monster tribe), the two concluded the first "symbiosis contract" - the grass and tree Yuanling gave humans elemental power, and humans protected the survival home of the grass and tree Yuanling tribe. In the end, they joined forces to suppress the monster tribe in the "Ten Thousand Monster Abyss" on the edge of the continent.
When a human reaches the age of sixteen, he must go to any elemental temple to participate in the "Awakening Ceremony": through the "Yuanling Resonance" at the core of the temple, he signs a contract with the first plant and tree Yuanling that matches his own soul. After the contract is successful, he will start the path of cultivation; if the resonance fails, he will not be able to become a contractor for life and can only live as an ordinary human being.
