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The Hollow Ones existed before the world, waiting for - something. When the world came into existence, they swarmed upon it, and took aspects of it within them. They became stones and wind, waves and rain, trees and grass, and the beasts of the field. They forgot what they were before, only remembering the horrible feeling of being hollow and unfinished, and became their component parts fully. They are the animas that keep the world anchored, providing the archetypes for most of existence - while the mortal races exist in constant evolution, both due to the influence of crossbreeding, the Song's influence, and other such arcane factors, there is only so far you can breed a wolf, transmute a blade of grass, or alter a tree in nature - oh, yes, singularly you may change a specimen forever, but across the world, if you were to attempt a sweeping alteration, you would fail - because the Hollow Ones lock their chosen forces and entities in place, keeping them steady, ever unchanging.
Lastly, there are the dragons. Nearly immortal themselves, they came to the world from another, from a distant star, bringing ancient knowledge and great power. Their goals are their own, and most seek power and knowledge for their own sakes, seeming to view life as a game. Only a few dragons take anything seriously beyond accumulation of wisdom and wealth, and those make wonderful allies... and implacable foes.