Not long into the first level of the challenge in the Sorcerer Goddess's Shrine, a few challengers stood out. They did not form teams with anybody and just fought solo. None of the monsters that passed them managed to survive. They were like fishes swimming freely in water whereby none of the monsters could stop them from whatever they wanted to do. Moreover, they did not only kill one monster per attack. Instead, they were like Grim Reapers, exterminating everything that came their way.
The first monster horde lasted for around two hours before the second one came. This time, there were immortal-levels rank-4 to rank-6 monsters. This stressed many of the teams as their efficiency significantly dropped while those who were weaker were injured, which affected their productivity even more.