The below chapter provides a complete walkthrough for Source of evil mission. It provides solutions for the challenges that you face in the main storyline of the game. Thanks to this, you will complete the game in the most optimal way. This mission ends in a boss battle with Shima Sakon.
This mission is relatively difficult, due to the multitude of opponents and their level. Just like previously, the game starts by the shrine. In the first arena, you will have to fight skeletons. After you defeat them, talk to the character standing by the ramp. You have to get to the red crystal. Along your path, you will be fighting skeletons and yoki. If you do not want to fight the spirits, dash through their markers. After you drive the spike into the crystal, run to the right immediately. There, you will find two Kodamas. One of them is in the corner, next to the tree, and the other on the tower.
Before you find the second crystal, you will have to fight Onryoki. This is the same opponent as previously, but this time it is a bit weaker. After you have defeat the opponent, drive the spike into the crystal and dash to the right. Past the buildings, activate the shrine.
Next to the shrine, there is a wooden building and another crystal, after you pass it by. Before that, defeat the two skeletons. Then, walk over to the other side of this location. In the building, you will find a chest and a Kodama. You can cross the entire location, collect treasures and Kodamas. Then, head towards the arena, where you fight Gasha-Dokuro.