Adventurer's association classifies a monster according to the threat level it represents to the humanity and gives them an appropriate class. If the monsters they have met up until now were only around normal and strong, then the being in front of them whose level surpassed 500, fell in the disaster class.
A class that could bring disaster to a large number of humans, towns, or a large city. There weren't even that many high-level adventurers in their kingdom and those that were could only be seen near the capital.
A disaster class being could only be subjugated by those adventurers, even their guild master who was the highest level among them, was only around level 360.
The moment when the race and the level of the entity in front of them was revealed, the morale of these adventurers immediately faltered and they couldn't but cower in front of the enemy.
