The fairness of the game is reflected in the fact that if you kill the boss, you can level up, and if you kill the boss, you can also level up.
OK, that's fair.
Shigure: Fair enough, sister, why do I, a humanoid monster, need to be killed to level up!
System (squinting): You can level up by letting you lie still and die. Do you still think it's unfair for such a time-saving and labor-saving thing?
Bastard, do you know, I was originally the woman who was going to be the boss!
Boss: Aren't you now?