The chest piece is inside the ruins, beyond the forest barrier. If you do enough searching you will find a tablet, telling you how to do a ritual, then u will come to a place that has and altar in a wall and a pool of water in the floor. To open the doors to the women elf ghost u interact with the pool of water, take the earthen jug, fill it with water, leave the pool, interact with the altar, which is to the west of the pool. Place the jug on the altar, kneel and pray, grab the jug, take only a sip, take the jug off the altar, leave the altar alone. Go back to the pool, empty the jug of water into the pool, the jug will shatter and the door will open. At this point if u want to be able to talk to the ghost, bring the elf assassin, if u didn't kill him and let him come with u. If you will either be able to safely guide her son's spirit to her if u had an elf with u and didn't scare him into become an revenant, else you're going to have to fight her most likely. In the tomb right in front of her will be the chest piece. I should of killed the tree so that I could get the headpiece, but sadly after freeing white fang or whatever, the damn hermit just does the usual stupid npc repeated lines and won't let me trade for it anymore.
[Edited by slowpoke2, 11/3/2009 6:17:49 PM]