As always, all four of them concluded their breakthroughs together. In fact, Celis wanted to do that as soon as they left the Upside Down World and emptied the Divine Stone mine. It's just that the twins didn't want to leave it up to chance, so they decided that they would first leave Pol Continent. That's the reason why they only made their breakthroughs now.
As soon as Rean finished, he immediately concentrated his Divine Energy around his body and jumped. Soon after, the Divine Energy moved off, and he began to fly in the skies. "Hahaha! I can finally fly again! Holy shit! I truly missed this feeling!"
Back in the Mortal Realm, one could fly as soon as they reached the Core and Soul Fusion Realm. However, they lost that ability when they arrived in the Realm of Gods.
Havek then flew to Rean's side and said, "Hehe! Just so you know, as a Sea Chilling Spirit, I could fly from the moment I was born. Well, floating would be the best way to put it."