Report your findings to Motega Firemane.
If I did not see that with my own eyes I would never have believed it to be true. Vengeance has come to Thousand Needles!
<name>, you must act quickly! Go now and seek out Motega Firemane; he is located at Whitereach Post just northwest of Freewind Post along the road. He will know what to do!
Vengeance! So, the legend of Arikara is true. Indeed, this is a problem that must be resolved immediately.
Upon completion of this quest you will gain:
The entirety of this quest happens at Thousand Needles