Riverpaw Genocide

Confoundit, $N, look at my farm! Not that there's much to look at nowadays. It wasn't much to begin with, but I had ambition! Now... now I have nothing, and it's all because of those damn gnolls!$B$BListen $N, I don't have much, but give a poor farmer what's owed to him—revenge! I want you to go out there and slay every last gnoll you find. Every. Last. One.$B$BOnce you've dealt with at least 8 Riverpaw Brutes, 12 Riverpaw Mongrels, and 10 Riverpaw Herbalists then return here to me for your reward. You should be able to find these gnolls to the West and then more to the North, parallel to the coast. And $N, I wouldn't mind if you lost count after a while, if you know what I mean.