The place to summon Arikara is one of the "needles" of Darkcloud Pinnacle. To get to Darkcloud Pinnacle, head south down the road from The Great Lift to where it splits. Turn left and walk a few paces, looking to your left. You should see a path leading up. Follow the path up to reach Darkcloud Pinnacle. The coordinates for the beginning of the path are (31,36).
Once you have reached the top, head to the needle with only one bridge attached to it that has a large fire pit in the center, surrounded by little tables with what might be mummies (this is where they bury their dead, after all). The fire will not be lit yet. Coordinates: (37,35)
Take this refined and purified Incendia powder to Thousand Needles and toss it on the sacred fire of life. It is located in the Darkcloud Pinnacle on an isolated needle where they bury their dead.
The enchantment that I have weaved into the Incendia powder will summon Arikara to you, <name>.
I fear she may be stalking Cairne Bloodhoof; too much Tauren lore has changed, and I fear this has angered Arikara. Move quickly before all is lost, <class>!
Reward
You will be allowed to choose one of the following: