Spirits of the Dead

When a sapient mortal dies, particularly an anthropoid, the release of energy separating the soul from the body would encapsulate the soul in magic. This new structure was called a spirit, an initially weak afterimage of the mortal it once was, but an entity can change and grow over time.

Revenants

If a spirit of the dead animates a corpse, this facsimile of a living being was called a revenant.