Reincarnation

Within the world of Coryphiel, it is the generally accepted belief that when a human being, or other sapient creature, dies, their soul is reincarnated into a new body much later. This process includes passing through multiple other "realms", most notably the Spirit Realm.
When a person is reincarnated, they do not retain any of their previous memories, and are unaware they even had a past life. However, their past life may manifest in minor ways, perhaps an inclination towards certain skills, or getting a sense of deja vu from certain places.