The below chapter provides a complete walkthrough for The mountain of Remorse. It provides a solution to the challenges in the side quest of the game, which will allow you to complete it in the best possible way.
Vengeful Spirit Visor
Smithing text: Daionjin's Sake
Highest quality lacquer x6
In this mission, your task is to find the mother of one of the peasants, who took her to the peak of a mountain to leave her. The gossip is that the mountain has been haunted by yokai and the peasant is pestered by pangs of conscience. To get there, you have to cross a forest patrolled by skeletons and yokai. After you defeat them, you will find stairs up. Next to the stairs, there is a cave, where you can activate a shrine. On the stairs, halfway up, you will also be fighting a raven that comes out from fog. The final battle is fought with three opponents. First,
Amrita Devil appears in the arena then, another one joins this one. The final opponent is Onryoki and Oni-bi. It is a good idea to have live weapon charged, because Onryoki may appear while you are still fighting the devils. Then, using the guardian spirit, you can eliminate the weaker opponents quickly and you will be able to deal with the boss.