Disaster / Destruction
The banishment of the Gods.
The most powerful wizards of the time repeatedly cast the Superior Banishment spell to banish the sods one by one. After they started the event that would come to be known as the severance, the sods began to attempt to destroy them. Due to the specialized magical defenses of the Lost City, it was almost impossible to find. When the gods did find it they encountered a secondary defense which reflected all of their attacks. Little did the wizards know that the reflected attacks would create the largest desert it Aria.