Take the Decoded Tablet Parchment to Commander Mar'alith.
Ok, here we are... a pretty valuable chunk of information, I must say! I've seen the Cenarion Circle forces arrive at Silithus. They plan to drive the Twilight's Hammer out, don't they? This will help.
Take this parchment to their leader, Commander Mar'alith. Soon the Twilight's Hammer will be vanquished and I will be outside their grasp for good!