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A Plane Will was the soul of a plane!
When all was said and done, it was simply a peculiar soul formed from a unique kind of aggregation!
What set it apart from an ordinary soul was its quality, its abilities, and its level!
Its growth also depended on the souls of the plane's living beings, along with the emotions and wills those souls gave rise to. That was why a Plane Will grew so slowly. Every advance required an immense accumulation of souls and energy, and millions of years to achieve!
As for why Dark Plane Wills, Light Plane Wills, and even Mechanical Plane Wills devoid of emotion appeared, it all had to do with the beings that lived and multiplied upon those planes.
The more numerous and powerful a plane's living beings were, the more strength they gave back to it, and the stronger its Plane Will became! The kinds of emotions those beings harbored determined what kind of Plane Will it would be.
A plane filled with beings strongly inclined toward darkness would inevitably give birth to a Dark Plane Will. A sacred plane like Heaven, on the other hand, would give birth to a vast, holy Light Plane Will.
A plane that developed mechanical technology would produce a rigid Plane Will, while others would be relatively more flexible.
Of course, under the rules of the Great Universe, Plane Wills born from the union of countless souls and wills rarely possessed independent emotions of their own. Even if some had distinctive personalities, those were generally just the result of influence from their native beings.
There were also many innate Plane Wills, of course, but they were rare and found it