Up a path south of Titan's Well at 4511, 5493, you will find a mountain glade with an altar. Surrounding the altar will be three Conjured Cruor, and Baelin. Baelin will not add when the Cruor's are pulled so clear them out first. Once clear handle Baelin and collect the Positive Keystone. Return to Alvarend Fergos at Camp Fergos for your reward.