Blackwind

When you start the Woods of Mirkania (West), progress until you get a message from Jackson about some Hybrid enemies. Continue on a short way, and you will reach a branch point, with a path to the left (this advances the level) and a path to the right which ultimately leads to a dead end. In this area, there are a number of stone pillars you can jump across (these will require some tricky Dash-Jumps), which will lead to a Skin and a B-Wolfrium upgrade. If you reach the fight agains the 2 Raknos War Beasts, you've gone the wrong way. See below for a video guiding you to the area and how to navigate the jumps.