Souls, as they are represented in Onimusha, do not represent the typical definition. They may, for instance, be harvested from defeated foes, wounded opponents, and from relics. Certain items can control the type of soul that is released, whether it is a blue, red, yellow or purple soul. The colour indicates which form of energy the soul possesses; yellow souls replenish life force, blue souls replenish magical ability, and purple souls can fuel an Oni Awakening, and red souls are used to improve weapons and armor.