Élos created Oliver with the “essence of life”. And before y’all ask, it’s not your “usual” essence of life that you would see on other types of media, according by Élos, this “essence of life” was made with these ingredients: Fairy dust; “rainbow tears” (Oliver is still trying to decipher what exactly would be “rainbow tears”); a “heart” of a bloody moon (not our moon, but rather a moon from another planet); a single tooth of a first born; golden feather from a wing of an archangel; Lillies of the valley; forget-me-nots; shards of an hour glass and some grass.
Oliver knows that Élos erased his memories from his childhood where he saw Élos much more than he does now because Élos wrote him this when Oliver questioned them how did they raised him: Élos -“on the 5° spring i simply couldn’t let you have any memory of me nor my face anymore… i would then take care of you from afar and have Morgel take care of you occasionally…”-. (Morgel is Élos pet crow that sometimes visits Oliver and brings him anything he needs: money; clothes; wood for the fireplace and the list goes on. And oh, Morgel can also transform into a human.)
Élos can’t see Oliver or be seen by him anymore because of a “barrier”. (Although Oliver believes they simply just don’t want to take care of him themselves anymore and that the barrier is just an excuse. But Oliver still loves them, even if he knows it’s just a lie)
Morgel and Élos share the same heart (Élos rescued Morgel from a hunter, and, to not let him die, Élos ripped off their own heart and sliced into two to share and replaced Morgel’s old sick heart)
Élos soul is inside Oliver’s amulet.
Élos is completely and truly neutral about Oliver’s decisions and life choices, to them, Oliver should be able to be free to do anything, even if it’s questionable. Morgel on the other hand, always tries to convince Oliver to basically be themselves, minus his questionable actions and motivations, especially towards the clones.