Soul

Every Manfolk and Fey in the Planes has a soul, split in three (technically four) parts. These are often represented in an Enchaeya. The top being the Essence, the right being the knowledge and memories, and the third being the Spirit, or personality. The center of the Enchaeya is their energy, that comes from the Ael, and dissapates when they die.

Essence
A person's Essence is the most defining part of their soul. It is their morality, the part of them that connects them to the world. It is created by a god before they are born. And then, when they die, it returns to its creator. Where it may be reused, saved, or sometimes, destroyed.

Knowledge
A person's knowledge, or Ghost, is their life's collected memories, gathered over their living moments. When a person dies, their ghost joins the deathly river of knowledge in the Shadowlands. In the Shadowlands, a ghost can be reached and spoken to, often to gain some knowledge they had. They can also be magically  contacted through various Revealing spells.

Spirit
The spirit is the personality and deepest emotions of a soul. It originates when a manfolk or Fey is born, and shifts and changes as you grow, forming as the soul forms.