Ewòg

An ewòg are ancient spirit-like beings in the world Toriel.

Reincarnation
Some ewògs such as Māwor, have joined the world of humans by reincarnating themselves into humans. The reason some spirits reincarnated themselves in humans was due to a great war between the spirits, which left some too weak so to survive on their own so they had to reincarnate themselves into humans. The human soul and ewòg soul merge to become one. so the human is just a human but at the same time an ewòg, but at death, the persons soul and the ewòg seperates, and the ewòg will reincarnate, usually within the family of the human.