Quick Transmigration Of The Divine Phoenix
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So in her conclusion, she just feels the world is just too low-levelled.
Mainly, the levels are divided into low-level, amateur level, advanced-level, intermediate level, high-level, god-level and the legendary S Level mission.
But all of these levels are also divided in 5 classes, the least being the F class, then E class, D class, C class, B class and the A class. The levels are completely different from each other, sometimes because of the difficulty of the task, or maybe the environment or the targets of the mission are all big bosses.