@somedude This is a bit of a spoiler, so read at your own descrition
Spoiler!
So the goddess Sepia created Rondel and all the creatures in it. But goddess Sepia has a son named Caius. Caius created Earth, using his mother Sepia's template. So Rondel and Earth are mirror of each other. Problem for Earth, the people forgot Caius. As a result, Caius disappeared. This result on the mana on Earth becoming thinner. Add environmental damage into why mana is getting reduced on Earth. Now Sepia has taken an interest on Earth and is trying to merge Rondel with it.
