Magnataur are hideously violent creatures... this is the main reason we rarely see them come together in any real numbers without killing each other. A powerful leader has stepped up somewhere among them and we need to hunt him down if we are to stop this threat.
I will start asking around. I need you to disrupt them as much as possible in the meantime.
East of here there are 3 torches erected. Near them, there are 3 dominant Magnataur - put them down to buy us some time to hunt down this leader.