What Yesak said, or try to get at least one other person along. named spawn a LOT in FOS, and there are quite often people running around killing the various animals. If you see a named up, and a person, shoot them a tell like 'lets hook up for this named', then roll on it. Half of some essences is probably gonna beat all of none.
Unless your server is different but any time I have been out in FOS there were people running about killing stuff. In some cases they may be raid people just grabbing some solo xp. Shoot them a tell saying 'can you give me a hand with this named'. they might want to rol for the essence on one of their twinks, or even just give you the essence.
Basically at the place you are at with your shaman, you'd be best off to group a bit. And definetely try to bump out those VOIDs if you can. spam the zone for help or to join a mission.
Are any of the FOS named root rottable? Sorry I don't recall. I do recall that when I was first doing that area I avoided that fricking crow. There are some named that are easier than others there.
Hope some of this was helpful and good luck! What server are you on?
Ride free brother.