This quest is not available in game.
Speak with Gerrig Bonegrip in the Forlorn Cavern of Ironforge.
Free! I AM FREE! I am free to gather strength, hidden from my captors. For if they faced me now they would surely overpower and again imprison me.
But in time I will confront the giants, and they will regret their wardship of me!
You are a noble ally, <name>. I will need your help again in time. When I am ready, I will need you to summon me to the surface.
Speak with Gerrig Bonegrip. He is in Ironforge, in a shop of the Forlorn Cavern. He knows how I can be summoned.