There is a wide variety of powerful weapons in "Beast of Reincarnation," and the Mountain Hunter Knife is one of the most useful among them. To obtain the Mountain Hunter Knife, go to the teleportation point next to the mysterious golem at the Giant Wall Terraces in the Mountain Ridge area. After speaking with the mysterious golem, you will receive the Mountain Hunter Knife.
How to Obtain the Mountain Hunter Knife in Beast of Reincarnation