The various Biomes of the Infinite Wilds are all interesting in their own way, and most look pretty cheerful. The Dark Forest is a wonderful exception to that, and a perfect place to explore as Halloween draws closer.
The Dark Forest is rather pretty from the outside, with dark red cliffs and rust colored water. Once you enter, though, your vision is limited by perpetual fog. This gives the Biome a wonderfully spooky atmosphere.
When night falls, though, the Dark Forest really shines. There are spooky trees that occasionally show red, glowing eyes. There are also odd plants that cast a red glow. Also, in the deepest parts of the Forest, you can find the occasional graveyard. Nobody knows who left the gravestones, though TigerTon Village has a quest that attempts to explain it.
There are also plants here that your horse will be afraid of, Spiderwort flowers that make good dye ingredients, and mulberry bushes that also have silk cocoons. It was plain that the Dark Forest was lovingly designed!
Two tips for adventurers:
If you are trying to gather Dark Forest Essence, stay on the edges of the Biome so you can see inside. Spot the various glowing balls and go in after them, then come back out so you can see again. This is a much easier way of finding Essence.
The horses here are tiny and dark, so if you want to breed miniature horses, this is the best Biome to catch them. However, I’ve really only had luck by using the Wild Whistle, which costs 100 Mobla to use.