Speak with Yorus Barleybrew.
Yorus Barleybrew has issued a challenge to all able warriors of the Alliance. He waits at the Lakeshire Inn, in Redridge, and pledges a grand reward to anyone able to pass his trial.
Hah! So you heard of my challenge, did you?
Well sit down and listen. Have a drink, and savor it... because it might be your last.