Sun lost his right eye from one of Moon's outbursts and he wears a bandage to cover it. Eclipse regretted all his mistakes he made in the past so he started working on a way to bring back dead people (not like zombies, no this isn't a apocalypse au like that only cause I have a huge fear of zombies), he eventually succeeded and tested it out on Lunar. Why you may ask? Well when Lunar got his own body he immediately died cause of Moon's kill code which brought Moon to blame himself for it.