At the beginning of the mission we go to the camp and go along the cliff on the left side.
After the ambush go to the next location and immediately to the right to the cave.
In the area looking for a barrel and blow up the wall.
When you reach the location with the wind of magic, go to the end until you reach the turn right, then turn left into the cave.
We leave the gorge in the open area and turn back. (if you look back) go to the top on the right side until you see the house with the corpse of a rat.
Top of the gorge will be tome, go around on top and jump down to him.