Question, would creatures from the Spirit world be mystical creatures that we already know from stories or would they be completely different than what we imagined and passed down from mouth as folktales into word as books?

(I wouldn't be surprised if the creatures changed after being passed down so many times to each new generation and be a blend of both common creatures we seen before and new creatures that we don't know. But yeah...)

{EDIT: 
1. Shaman
2. Geomancer
3. Aethrmancer }