From Lotro-Wiki.com

Lore

Wargs are often deemed a scourge of Men because their preferred prey are the herds and livestock upon which many villages across Middle-earth so depend. In this regard they are much more scourge than the lesser breeds of wolves, for Wargs are known to wantonly slaughter livestock even after they have sated themselves, leaving entire herds to rot.

Never have you seen such mindless ferocity as in the eyes of a Warg. They outwardly look similar to lesser wolves, but they are far more cunning and vicious.

Objective:

Defeat 50 Wargs

Reward:

Man of the Fourth Age: Your will is improved.