Question: what is the difference between aedra and daedra?
Answer: TL;DR: the aedra are spirits which sacrificed some of their power to create the mortal plane. The daedra are all the spirits which did not sacrifice their power, and are thus objectively stronger. ... In time, Lorkhan tricked a group of Et'ada into forming the mortal plane, now known as Mundus or Nirn.