Bring 5 Singed Scales to Uzzek at Far Watch Post in the Barrens.
As a warrior, one of our most crucial tasks is... protection. We are the shield of the Horde, and we keep our weaker brethren safe. If you are to join in our ranks, then you must prove your mettle to me.
Go to Thunder Ridge in Durotar, where live the lightning hides and thunder lizards. Hunt the beasts! Show me you are tougher than they! Brave their assaults and bring me a stack of their singed scales as proof.
Do this, and then I will teach you.
The following spell will be cast on you:
Do you have the scales, <name>? Unless you can withstand the attacks of the thunder lizards, you will not benefit from my instruction.
Ah. I see you have defeated the thunder lizards, which proves you are tough. Now I will show you how tough skin and shrewd movements can combine to form an impenetrable wall of defense.
Learn your lesson well, <name>. And be ready for future instruction.