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There is a quest that begins just west of the fork in the road that is south of the quest circle for "cleanse dread vullain", start that quest and it takes you to a cave called "neried temple." You literally need this quest to finish "Cleanse Dread Vullain," and the game leaves it completely up to you find this quest without hints or anything
I can vouch for this. NPC that starts the quest is South West of the quest area so if you approach it from ANY other direction (like I did) you will be completely lost. This was extremely frustrating, I can't tell you how long I ran around inside the quest area trying to figure out how to "cleanse the area" before finding the NPC that actually starts the quest and re-unites you with the Bosmer from before (if you have logged etc.)
There is NO NPC in the southwest area of the Circle. I've been all around there back and forth. No NPC anywhere to start another quest to take me into the cave. Give a Map location in a jpeg.
Where my actual character is. South of Cleanse Dread Vullain
The quest I show above, and 'Retaking the Pass' are the actual 2 quests that help progress 'Shades of Green'. So you don't have to spend hours killing skeletons and mages under those bridges unless you really enjoy it