"Sealed Mana Artifacts were that powerful?" Wallace asked to confirm his thoughts. Although he was aware of these artifacts, he wasn't aware of it's true capabilities.
The Mana Calamity could not be treated lightly based on his several sources. It really has to be taken seriously if this is the truth.
The 'Illusion of the Venarian Town' was one of the tragedy that has occurred during the time when exploration within the northern continent was still a hot subject.
After more than 5 years of stabilizing the wide scale production of 5th generations of Mana artifact, people set their eyes on the northern continent feeling that they were strong enough to launch an expedition within the inner region. Unfortunately, this caused them thousands of lives and only the 24 known individuals survived.