The will - Nature's will - is the power bestowed on the Golden Willow tree by the Nature spirit. It is this world's biggest weapon against any enemies who wish to bring doom to Defrox. The one power which can only be used by beings acknowledged by Nature, herself.
The will recites a person's destiny, it recites the absolute truth of one's life. No lies can go hidden under Nature's eye. It might show the person how bliss heaven would be or how nightmarish hell would be like…
When one is ready for their future to be read, they are preparing themselves to face both despair and hope, irrespective of what one's future holds. One would have to clear their mind and give themselves completely and solely to Nature by the touch of their hand on the book of will. The golden light breaking out of the will would dive into their souls and read their future while the person is in a semi-conscious state.
But, things go wrong when two people defy the rules of will.