Report to Nakansi at Invasion Point: Cataclysm.
Now that we have access to the Legion's base at Invasion Point: Cataclysm, we need to figure out a way to shut down their operations there. Shadowmoon Village won't be safe until the Legion's presence is erased from the valley.
I've sent an advance party up to the invasion point to help you formulate a plan to destroy the Legion's supplies. Go back to Legion Hold and step into the teleporter with the green crystals above it. Nakansi will meet you at your destination.