What does nerfing mean?
Game balance
Balancing does not necessarily mean making a game fair. This is particularly true of action games: Jaime Griesemer, design lead at Bungie, said in a lecture to other designers that "every fight in Halo is unfair".[4] This potential for unfairness creates uncertainty, leading to the tension and excitement that action games seek to deliver.[1][5][6] In these cases balancing is instead the management of unfair scenarios, with the ultimate goal of ensuring that all of the strategies which the game intends to support are viable.[4] The extent to which those strategies are equal to one another defines the character of the game in question.