We braved the Rivenwood because of my troubled dreams concerning my worg life-friend, Ulfang. He has called out for help, and you must go to him.
But, you do not have the means to speak with him, or walk amongst the other worgs. I know a way.
First, you must cleanse your inner turmoil.
There is a shrine that sits at the top of Frostblade Peak, northeast of Camp Winterhoof. A single path leads up to it from the western base of the mountain.
Meditate there and then return to me.