My Elf Brother Is My Tool

Why is this elf immune to my killing blow? Then I thought about it, really, it turned out to be because he was a loser... Forget it, let him just be my tool! … It's strange, why after I labeled this person a "waste", Still having a good time? Alas, there is really nothing we can do against him... The perspective of the elf brother: "Sister Angel can't do anything to me" Stone Continent Eut Empire (1 group): 1047120308