Divinity can be found in the strangest of places, as everyone in the world will know. After all, gods and their creations walk amongst us. Creatures and plants spun from the very life essences of the world, or constructs of stone and metal that have their own spark of life breathed into them. None of them compare to the ancient majesty of the Yoldeik Forn. Also known as World Trees, Spirit Trees, or many other names depending on where you are from, they are the subject of study, legend, and folk tale across the world. Even countries and nations that have never found one within their borders find them singular in their intrigue. The trees themselves take many forms. Some have an otherworldly appearance; colors that shift and bend, and small fairy lights that swirl around them. Others look like mundane trees at a glance, though usually visibly larger. Only revealing their true nature upon closer inspection or to very specific individuals that they choose. These options only cover a small possibility of the physical appearance of the World Trees as well, with anything and everything existing within the realm of possibility. The most famous example is a pair of Spirit Trees found in Geirstðr. Ones trunk, branches, and leaves are all a crystalline material, each differing in color. The trunk and branches are a deep grey-black, while the leaves are a smattering of reds and whites. The sister tree looks like a larger than average maple tree, with the weirdest thing about that one being that maple trees don't exist naturally in Geirstðr. Regular branches, regular bark. Ancient Geirstðrans even went so far as to tap the tree for it's sap for a great many uses both medicinal and tribal. The one trait all World Trees share, however, is that every person who views one, without fail, believes they are viewing something special. A unique light within the world. It's a deep-seated, primal feeling that wells up in the hearts of man. God or mortal, the feeling is universal. This has lead to theories that the trees are somehow tied to humanity, its inception and/or its raising, though we can only guess as to how. Those answers slipped away with the Old Gods, and may be out of reach forever.
Uses, Products & Exploitation
The World Trees' uses have already been widely discussed, so in summary, they are hugely divine creatures that defy explanation and characterization.
Geographic Origin and Distribution
Above the human average.
Symbiotic and Parasitic organisms
Others can, and have, made the argument that humans themselves have a symbiotic relation with the spirit trees. Humans protect and care for the trees instinctually, and in return, the trees provide boons in various forms. Magical artifacts, Oracle-like visions, etc, etc. It's up to the tree.
Terrarum Antiqua Ligno
Each subject of the species is fiercely guarded by the humans that live near it. Their motivations might change between themselves, but protect they shall. If no humans are nearby, and sometimes even if they are, animals often come to the aid of the tree if it has been put into danger.
Body Tint, Colouring and Marking
Across the gamete of possible and impossible.