Call of the Talon King

When you hit Exalted reputation with faction <Arakkoa Outcasts>, you'll be able to get and complete this quest (automatic pop-up, just make sure to leave that zone and come back). After that you'll be granted achievement <Mantle of the Talon King> and will be available next quest in order to get a follower <Talon Guard Kurekk>

Shade of Terokk says:

Spoiler

Long have my people suffered the Curse of Sethe, and long have we sought a cure.
Sorceries, rituals and rites. Unspeakable acts of darkness and desperation, all for naught.
We found refuge in the shadows, yes, but also shame. We lost our way.
I led my people astray. You would have been fair to shun them as others do.
And yet, you showed them kindness. Curious.
You gave them strength. Though the curse may forever weigh upon their bones, I see them standing tall and proud.
You have succeeded where I failed. You have set my people free.
Truly, you are their Talon Queen.

This is the final quest to earn the achievement Mantle of the Talon King, which requires you to complete the Terokk's Legacy storyline and earn exalted status with the Arakkoa Outcasts.

Terokk's Legacy Storyline:
1. The Kaliri Whisperer
2. Rites of the Talonpriests
3. The Talon King
4. The Missing Piece
5. Terokk's Fall
6. A Worthy Vessel
7. The Avatar of Terokk

After you complete the storyline, you will go to Veil Terokk in Spires of Arak to do the final quest Call of the Talon King and gain the title Talon King or Talon Queen. Then speak to Talon Guard Kurekk standing nearby, and gain him as a follower. Note: If the final quest Call of the Talon King does not happen automatically, you will need to leave Spires of Arak and come back for the quest to pop.