Oh, Ex-Deus's flashback shows scientists in modern lab coats?
Are they gonna pull the "This is actually Earth in the future" twist? And maybe she has actually been communicating with the past through the internet?
We got the backstory when Thera was revived, this was a regular scientific world having a resource crisis, so the Goddess of Earth Tera gave them the dungeon core hidden deep underground, and all hell broke loose as people fought over its power, rampant wishing on it changed the world to what it is now then Tera went Evil and got sealed away.
I'm so glad the "it hurts to be without her" phase didn't last long. I don't think I would have been able to hold the tears back. No tears in the cute chaos goblin manga, please.