Like the tauren, Forsaken, trolls and blood elves, so too do the taunka need a leader born of their own blood. The one you saved from Icemist, Roanauk, will be this leader
<Overlord Agmar hands you a parchment.>
I give to you something familiar - the blood oath of the Horde.
Take the oath to Roanauk Icemist and initiate him into the Horde as leader of the taunka.
Roanauk Icemist says: Gather, brothers and sisters.
Roanauk Icemist reads from the scroll as the other Taunka gather around him.
Roanauk Icemist says: Lok'tar ogar! Victory or death - it is these words that bind me to the Horde! For they are the most sacred and fundamental of truths to any warrior of the Horde.
Roanauk Icemist says: I give my flesh and blood freely to the Warchief. I am the instrument of my Warchief's desire. I am a weapon of my Warchief's command!
Roanauk Icemist says: From this moment until the end of days I live and die - For the Horde!
Roanauk Icemist yells: For my Taunka brothers and sisters! FOR THE HORDE!
Overlord Agmar says: Welcome to the Horde, High Chief. Lok'tar ogar!