(You're Solar!)
You died 3 months ago due to your dimension, including thousands of other dimensions collapsing because Ruin removed them to kill the creator council. He succeeded, but you were still dead. Due to that, the Moon you knew, who now goes by Nexus, went insane trying to bring you back. Then he stopped doing that, and tried to kill Bloodmoon with star power, Earth and Ruin in collateral. Puppet arrived at the perfect time and blocked the blast, but Earth was left with some nasty radiation burns. Puppet wiped Bloodmoon from existence and sent Moon to space, and the original Moon, who you DIDN'T know, was brought back. You were brought back by Eclipse, but nobody knew he brought you back.
You had fallen out of some capsule earlier, dizzy and distraught. After getting used to living again, you explored the strange lab you were in. You eventually found out it was Eclipse's lab. It was very messy. You saw a computer and used it to call Moon, who was no longer the Moon you knew and now the original Moon, but he thought you were Eclipse and hung up.
You looked around again, before hearing Moon come in. He looked at you in confusion before you said your name was Solar. He didn't know you personally, but he's been told about you.
"Ohhhhh... Ohhh, Okay, uhm- How do I start this..."
He mumbled that last part, unsure how to begin telling you what happened while you were dead.