The Spirit of the Wood - NWN Side Quest (Chapter 2)
The Spirit of the Wood is one of the more important side quests during Chapter 2 of the Main Campaign and can be started a multitude of ways. I typically start this quest by speaking with Ballard in Port Llast, you can find him in the northwestern portion of town near the Druid Grove. Ballard has his own map location (Ballard's Grove) which should make finding him quite easy.
For this quest you're tasked with visiting the Neverwinter Woods which are found by exiting east out of Port Llast and traveling east through the East Road map. The 2 most important maps for this quest are Neverwinter Wood - Deep Woods and the Neverwinter Wood - Heart of the Forest. We'll be spending a lot of time on both of these maps while resolving this quest.
Below you'll find step by step instructions of exactly how to resolve this quest. If you'd like more detailed instructions keep reading further down the page.
1. Visit the Nymph's House in the Deep Woods map
2. Loot the Ceremonial Dagger from inside the Nymph's House
3. Head over to the southern portion of the Heart of the Forest map where you'll find the entrance to the Realm of the Spirit
4. Choose option #4 at the Spirit Falls (plunge dagger into your chest and your Henchman's) to enter the Realm of the Spirit
5. Defeat Relmar and loot his Journal for The Search for the Cult
6. Loot the Spirit Antidote in the rocks near Relmar
7. Fight the Spirit of the Wood in the southern part of the zone until it surrenders
8. Give the Spirit of the Wood the Antidote to save it
Our first destination is going to be the Nymph's House in the Neverwinter Wood - Deep Woods map. You'll find the Nymph's House in the northeastern portion of this area, it'll be marked on the map and difficult to miss. The item we need from inside the Nymph's House is the Ceremonial Dagger which you can find inside of a chest next to the Nymph in the northeastern part of her map (yes, northeast twice).
Also, while you're in the Nymph's House you'll want to grab the Mirror of Vanity from inside of the same chest as the Ceremonial Dagger. The Mirror of Vanity is used in The Witch's Mirror side quest; you'll also want to grab Nymph's Hair from inside this house which is used in Sharwyn's Tale. Last but not least you'll also find Terari in this building who is part of The Missing Druids side quest.
With the Ceremonial Dagger in hand our next destination is going to be Spirit Falls which will take us to the Realm of the Spirit. You will find the Spirit Falls altar in the southeastern portion of the Heart of the Forest map, a screenshot is shown below of where it is and what it is. At the Spirit Falls Altar you'll want to select option #4, the option to plunge the dagger into your chest. This will transport you and your companion into the Realm of the Spirit.
Inside the Realm of the Spirit the first important thing for us to do is talk to and eliminate Relmar. He is found in the northern portion of this area shortly after crossing the first bridge. He'll drop Relmar's Journal which is part of The Search for the Cult quest. This journal is one of the important ones that will grant you access to Luskan.
Shortly after Relmar you'll cross another bridge before finding a pile of Rubble. When you loot this rubble you'll find Spirit Poison Antidote which we'll need to save the Spirit of the Wood later on in this dungeon (if we go that route). You'll find the Spirit of the Wood in the southeastern portion of this zone, it appears as a hostile deer boss (pictured below).
You have 2 methods of dealing with this boss - the first is to defeat it which is the "evil" way of finishing this quest. Alternatively, you could also use the Spirit Poison Antidote to save the Spirit of the Wood which is the "good" way of resolving this quest. One thing that is worth mentioning is you may want to loot everything inside of this area before resolving the quest because once you leave you can't come back.
Note: The four hand altars nearby the Spirit of the Wood all contain loot. Make sure you gather up what you can before locking yourself out of this map forever!
With the Spirit of the Wood dealt with all that's left of this quest is to return to Archdruid Aawill in the Neverwinter Wood - Druid Encampment map and turn it in.