Baldur's Gate 3: Investigate Selunite Resistance Guide

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There are two ways to accept the Investigate the Selunite Resistance Quest: in the Last Light Inn Cellar or by unlocking the Potter’s Chest.

Last Light Cellar Location

The quickest method is to read Halfred’s Note in the cellar of Last Light Inn, located north of the Shadow-Cursed Lands, west of your starting point in the area. While inside the Inn, you are temporarily protected from the Shadow-Curse. Head outside to the east of the Inn, then north, and enter the door near the docks to reach the Cellar, which contains cells.

In the Cellar, pick up the Last Light Detention Cell Key from a table in a side room. Proceed to the large open room in the north. Move the Wooden Boxes in the northeast corner to reveal a door, which is blocked by spiderwebs that need to be burned. The next room contains a Cracked Wall next to large wine kegs with a Smokepowder Barrel in front. Move to a safe distance and shoot the barrel with fire to create an opening.

Enter the hole to find a large room with a thick root in the center. This room features a challenging battle against several Meenlocks. Use stealth to get close and launch a surprise attack on the nearest Meenlock on the northern ledge. These creatures possess a Meenlock Fear Aura, which can immobilize and frighten you unless you succeed on a Wisdom saving throw. They have no resistances, but their numbers compensate for this. They can also shadow-teleport to your location. Pushing them off the root deals damage and briefly removes them from combat. After defeating the Meenlocks, find the Last Light Side Entrance Key and Halfred’s Note at the back of the room. Reading the note initiates the Investigate the Selunite Resistance Quest. Note: The side entrance to the right of the note leads to chests and another cracked wall that returns you to the initial door.

Potter’s Chest and Key Location

This method requires less effort but involves traversing the Shadow-Cursed Lands. If you lack a Moonlantern for protection, use a torch on a character and stay close to them. Travel via the “Shadowed Battlefield” waypoint in the center of the Shadow-Cursed Lands and follow the path west.

At the end of the path, you’ll find a dilapidated building filled with pots and containers. Approaching the building triggers a battle with a group of Meazels. Use Sneak to gain surprise before initiating combat. While not overly difficult, Meazels have a Garotted ability that inflicts Silence and deals significant bludgeoning damage per turn within 5m. Moving away breaks the effect but may provoke Opportunity Attacks, so pushing them is advisable if your character is strong enough.

After defeating the Meazels, approach the building’s stairs for a Perception check. It’s recommended to quick save beforehand. Using Shadowheart’s Guidance spell can improve your chances. Passing the check reveals a loose brick in the wall beside the steps, yielding the Potter’s Key.

With the key, find the chest inside the same building. Continue through the building while holding the 'Alt' key (or equivalent) to highlight interactable objects. The chest is located at the back, on a ledge. Jump to the ledge and open the chest with the Potter’s Key to find a Note among other loot. Reading this note starts the Investigate the Selunite Resistance Quest.

Head to the Mason’s Guild

Next, you need to reach the Mason’s Guild, located in the southwest of the Shadow-Cursed Lands, where the curse is more potent. If you don’t have a Moonlantern for protection, acquire one now. You can obtain it from Kar’niss, related to the Harpers Ambush. With protection, head west from the Shadowed Battlefield waypoint or southwest from the Last Light Inn.

Cross the dilapidated bridge to the western part of the map, then head north into the Mason’s Guild area. Continue north into the building and proceed west to find the Ornate Wooden Hatch at coordinates X:127 Y:29. Enter the trapdoor and make your way to the western wall to find a “Keyholded Herald.” This object requires the Tower-Shaped Key or lockpicking skills. The key can be obtained by convincing Mattis.