Inside that formation range, Rean could control the flow of Divine Energy, so it wasn't a risk for the people in his Blacksmith Workshop or Roan's Alchemy Workshop. In any case, that help wouldn't be necessary for long. Everyone is born at the Foundation Establishment Realm in the Realm of Gods, so those below, even with just a little bit of Divine Energy, really cultivated very fast until they reached that level.
In just a bit over two months, every single human from planet Earth had already reached the Foundation Establishment Realm. Of course, those who stayed inside the Soul Gem Dimensional Realm were cultivating even faster. After all, the speed of time in there was at least twentyfold higher.