The story behind the actual eris in our world says that she was a trickster in some accounts and gave the fruit that started the war. I think I made a post or comment about it a while back. Basically a reference to eris being savathun and the unknown artifact in the pyramid ship being the fruit that starts the final war. Kind of a stretch but it fits. Mara Sov could definitely be savathun since she devised the plan for her brother oryx to slay her during the initial taken war and gain power in her sword world. Also because savathun has visited the dreaming city and riven and all that, there’s definitely a huge connection somehow to sav and sov. Both are cunning and hold secrets