Treasure of the Lossoth
Quest Writeup:
At the end of the chain of quests which starts with "The Jewel of Ice" in the Great Lodge of Sûri-kylä, you are tasked with delivering the Jewel to Rikitsa, also in the Great Lodge. Once you do this, you receive one of three different necklaces for one of three different jewelry sets in Forochel.
Permission:
I give permission to LOTROinfo to freely use this content. 
