This one rather hard to reach. I came from the South and hit both types of Elite Spiders with 7k+ hp each. Remember it is a set of ruins, so as you watch your location (;loc) and see a structure above a cliff keep following the valley North-West to get to the entrance. That is the way I found it but there is an easier way to reach the ruins.
I suggest heading to Thorenhad to sell & repair then set your milestone. Then head North thru Nan Tornaeth heading North-West. Coming in from the East side you should only have to kill a dozen Corrupt/Twisted Trolls instead of 100's of spiders, plus killing the Trolls killing adds to your deed.
Edited, Aug 5th 2008 4:18pm by agonizer