Finally, it was Reiger...
Well, he had already started to solo.
He seemed to be quite infatuated with the feeling of instantly blowing everything around him away with a "Nuclear Explosion", every time a giant guard rushed out from the city, he always teleported directly to the densest part of the enemy with a "High-level Teleportation", and then it was a "Maximum Enhance·Nuclear Explosion" that exploded on the spot.
Under the effect of this explosion, which had a very wide range, and among all the rank magic, it was considered one of the top in terms of attack range, Reiger honestly felt like he was facilitating a nuclear flattening of the world. Once a "Nuclear Explosion" went down, everything quieted and became peaceful.
In such a scenario, even if the giant guards had extremely high "endurance", comparable to Lv.7, they would still crumble directly in the massive explosion.