"A mysterious part of the woods nobody seeem to know about." - Description of Dark Woods
Dark Woods is a part of the map that you can unlock by defeating Brushbeast in Woods.
Look Closer at Habitat
The woods has almost the same scenery as Woods but it was covered by the ink of Brushbeast. You can found Black Paint, an item that unlock a color you can customize your Vulpin.
An item you can get in Dark Woods
A screenshot of Dark Wood