okayyy so this humble one is looking for novels where the MC gets stronger by killing monsters/aliens and the like but this doesn't really have to be limited to the MC. like, either only the MC can upgrade through killing or literally the whole world can upgrade through killing. in other words, you can say that im looking for novels where there are monsters to kill and powers to get. mmkay thanks in advance.
Renegade Immortal I think this novel is not what the author is looking for. Since the increase in the murder aura is just a side effect, even more so even if this aura did not exist, nothing has changed, that is, the murder aura does not affect development. In many Chinese novels, after many murders, the protagonists get an aura of murder, but this is just a side effect. Sorry for my bad english.