Metaphysical / Paranormal event
With the discovery of the Great Magic Circle, many scholars wanted to find the purpose of it. This caused the Holy City of E'ath to be flooded with the many groups of wizards and scholars that took turns trying to activate it for decades until eventually a group eventually succeeded.
Whether by luck or skill a group of wizards eventually managed to turn on the Great Magic Circle even if only briefly. During its activation it put out a shockwave similar to the tremors felt whenever a new world tree would rise. Although it only lasted less than a second many druids from all over E'ath believed it to be the birth of a new world tree which would finally rid Li'li'kunar of its final fruit and possibly spell the end of E'ath as a whole. As such they hurried back to the holy city only to find everything safe. Having witnessed the catastrophic might of the magic circle, the Holy Order of Druids were quick to take action against the wizards who had activated the circle. Their research material was confiscated and the circle itself was sealed and to be guarded forever by the druids.