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Investigate Kagha is a sub-quest of the Emerald Grove's main quest; Save the Refugees. It can be initiated by reading The Rite of Thorns, found in the Emerald Grove, or finding another clue hinting towards Kagha's scheme.
Objectives
Objectives and journal entries may vary pending story decisions and outcomes.
Walkthrough
This is multi-staged quest that can have several different outcomes, though it roughly follows the same path. Upon receiving this quest, the party is implored to search the Druid Grove to investigate Kagha.
The first clue
The vital clue required to progress this quest lies in the Half-Torn Note within Kagha's chest (X: -484 Y: -7, in the Emerald Grove. Interacting with the chest is considered a crime, meaning the party must engage with it while out of sight if they wish to avoid attitude lost. This is fairly easy to do, especially by hiding and entering turn-based mode, as the chest is tucked away in a dark corner behind a bookcase. The chest is locked and requires a 
DC 10 Sleight of Hand check to open. If the party is unable to pass the Skill Check, they can alternatively destroy the chest.
Following the clue
Reading the note reveals that Kagha has been corresponding with someone named Olodan, who asked her to meet alone at the "swamp". The swamp that the note is referring to is located in the Putrid Bog X: 97 Y: 224, in the southern part of the Overworld map.
The swamp is guarded by 2 Wood Woads and 4 Ancient Mud Mephits who will be hostile on sight. The Wood Woads have the ability to regenerate 10 Hit Points per turn, but are vulnerable to fire damage which also breaks their regeneration. The Ancient Mud Mephits are fragile, but will endlessly summon Young Mud Mephits until they are dealt with. Furthermore mud and tangling weeds predominate on the battlefield, making mobility challenging. On higher difficulty levels, achieving Surprise with e.g. Invisibility can help buy enough time to whittle the enemies down before they can respond.
Once the enemies have been taken care of, a success on a DC 5 Perception check at the large tree at the center of the island X: 86 Y: 220 will reveal an interactable wooden crevice on the south-west side of it that hides the Letter to Kagha.
Reading it reveals that Kagha has been scheming with the Shadow Druids to take over the Emerald Grove and install herself as the First Druid.
Confronting the Shadow Druids
With Kagha's secret now revealed, all that is required to finish this quest is to confront her back at the Druid Grove. Confronting Kagha forces the Shadow Druids Olodan, Wren, and Pinta—who have been hiding in the Grove by wildshaping themselves into Rats—to reveal themselves.
The party can try to convince Kagha to repent and break her alliance with the Shadow Druids ahead of the fight, turning her into an ally in the upcoming confrontation. To do so, they must first pass a DC 15 Persuasion check (10 if you are a Druid) to stop her from immediately jumping into action.
After that the party must also succeed on another DC 10 Persuasion, or Religion check to convince her to join their side. If the party has read the plaques inside the Emerald Grove and learned of the grove's history, they have an alternative option to succeed on a DC 5 History check (Automatic success if you are a Druid) to convince Kagha. Some races (i.e. Wood-Elves) or classes (i.e. Rangers) get an auto-success option.
Alternatively, if the party uses the Detect Thoughts spell at the start (instead of the Persuasion check), they only need to pass a single DC 13 Intelligence check to convince Kagha.
After that, a fight breaks out against the three Shadow Druids, with Kagha either joining them or the party depending on the dialogue choices. The other occupants of the Druid Grove, such as Rath and Silver also join the party against the Shadow Druids.
After the battle, if Kagha is spared and the player character is a Druid, she bestows upon them the title of Faithwarden and award them with the staff, Pale Oak. If Kagha perished during the battle, the party can loot the magical amulet Broodmother's Revenge off her body.
Rewards
Broodmother's Revenge, looted from Kagha's body
Pale Oak, awarded to the player if they are a druid
Hellrider's Pride, awarded by Zevlor- 15 Exp for confronting Kagha
Related quests
Companion approval
- If Kagha is convinced to stand down through reference to the frescoes and nature's teachings
-1 
+1 
+1 
+5 - If Kagha is confronted and attacked +1 +1 +1
Notes
- The letter to Kagha in the Putrid Bog is there even if the party hasn't started this quest. With meta knowledge or simple thorough exploration of the Sunlit Wetlands, it's possible to "skip ahead" by finding it unprompted. The quest starts and the party is told to confront Kagha.
- The fight with the shadow druids can be avoided but may cause a bug: If you shoot one of the rats just before the final conversation with Kagha, the rats will just run away, the conversation with the shadow druids will still occur, but when it is finished and if Kagha is convinced to help you in the fight, there will simply be no fight. However the bug is that the quest will remain in the journal and you won't get Pale Oak if you were otherwise eligible for it.