Well, I would rather do it in narritive, I could easily describe the forest here too.
As I said, I got the idea from Darkwood Forest in the video game Fable, well, at least for the name. The forest itself is composed of trees that are tinted black, gigantic trees further in and simply massive ones way deeper. The forest is thick in some places and thinner in others, though the thinner parts are more heavily inhabited by monsters.
I am gunna write this in second person, please pay no mind to it it. Writing like this is more comfortable for me when it comes to describing the five senses, Like Dming in D&D
When you enter Darkwood you can see a thick forest with big black trees with dead, vile looking branches and wreathed in an almost supernatural darkness and fog. The ground is thick and overgrown with roots and moss that can be slippery when wet, the ground itself is also very uneven the trees themselves have leaves, but the branches are often more twisted and wicked looking. Thorn thickets cover a lot of ground in the darkwood with long deadly thorns like the ones that surround Vincent's tree and keep him protected from intruders and monsters alike... The forest is hauntingly dark, and everywhere you look you can see movement out of the corner of your eye, you don't know if it is something that could kill you or it was just your imagination. The deeper you go the creepier things get, you could cwear you have seen that tree more than once, yet you are loyaly following the path deeper into the woods. An Icy chill sweeps over you as you continue down the path, the path grows narrower as you go, becoming obvious that whoever reaches this section is usually in a rush, the path itself is overgrown with vegatation as is most of the ground, thorny plants, nightshade, you name it form a blanket over the ground in the unnatural silence. In the distance you can hear noises, strange calls from birds you have never heard before, or even other creatures that would lurk in the very depths of your imagination, the sounds send chills through your very soul. Deep in the woods you hear movements, something big crashing through a thicket, your mind goes on alert and your hand's grip tightens on your sword, you pause to peer along and to observe your surroundings. Threat black trees surround you in every direction, the path has all but dissapeared, in the distance you can see something, an ancient spire, tall enough to break the canopy. With the thought of a landmark in mind you use your sword to mark a tree and sprint towards the spire. Four hours later you stumble upon a tree tith a strange mark on it, the very slash you put on it, you had been following the path the whole way, darkness was falling and in the dark you hear a sound that makes your hair stand on edge. a Howl, nearly sounding like a human screaming with rage mixed with the baying of a wolf. Filled with panic you run, the howling following as you go, stumbling into the night, but you will never leave The dark forest has claimed another victim
It is kind of difficult to describe, though I am looking for pics of what might match the look.
Deeper in the forest is another region called Ghostwood, which I can describe similarly
And I agree, I am not sure if it is a high magic world, or at least if humans can wield the forces, if not all humans able to, I think magic would only be gifted to a select few, perhaps like a bloodline ability. Vincent's gift is his magical powers and his power over the dark, nuff said there.