Soul

A soul is an entity that is capable of thinking, talking and interacting with the world around it.

Most of the souls are made of 5 soul fragments:
Ren - name, identity, destiny
Bu - personality
Shu - shadow, past self
Ib - heart, empathy and moral
Hazz / ḥaẓẓa - luck, fortune

These soul fragments must be held together by a Body (Khet) otherwise they are highly unstable and there is a risk of soul fragments detaching from the soul. Single soul fragments and not capable of functioning on its own and it has only an instinct to go to Kṣetra.