Travel to Blackrock Spire and destroy the source of the worg menace. As you left Helendis, he shouted a name: Halycon. It is what the orcs refer to in regards to the worg.
You have no doubt seen the worgs which the Blackrock orcs command.
It is curious - no matter how many we destroy, their numbers never dwindle. My scouts have reported that the worgs are bred, trained, and ultimately exported from Blackrock Spire: capital city of the Blackrock orcs. You must travel to Blackrock Spire and discover the source of this menace. Discover... and destroy.
Good luck, <name>. May Cenarius protect you...
Halycon is surrounded by several non-elite pups which can be easily managed. When she dies, she will cry and summon her mate, Gizrul the Slavener. He will arrive after a little while so a good plan is to run to the back of the room after Halycon dies. Gizrul will not aggro if everyone is at the back of the room. Once everyone is healed up, you can take on Gizrul.
You will be allowed to choose one of the following: