Remnant 2 is full of mysteries. Sometimes you find an item like the Nightweaver Stone Doll and have no idea what to do with it. The good news is that we've already figured it out. If you take this item to the right place, you can get a really nice weapon.
Remainder 2: How to get the Dreamcatcher (for secret interactions)
The Nightwaver Stone Doll must be taken to the Tortured Asylum and fed to a spider web in order to obtain the Dreamcatcher melee weapon. Yes, it sounds crazy, but it is. The good news is that once you have the Nightwaver Stone Doll, you are actually well into a secret quest chain to not only obtain the Dreamcatcher weapon, but also a secret class called the Invader.
So, you’ve opened the woman’s cell in the Sanatorium and gotten the Nightweaver Stone Doll. Now you need to progress through the game. Follow your quest marker for the main storyline. There’s actually quite a bit of gameplay before you get to the next relevant part, which is finding the Soulkey Tribute. You may have to navigate through several new areas, including a castle with a very fancy look, so don’t be afraid.
This item can be found after fighting Magister Dullain or The Red Prince, whoever appears in your game. Once that fight is over, you'll find the Soulkey Tribute shortly after on a corpse that's been somewhat abused by the Nightweaver himself. Simply follow the story missions from the moment you get the Nightweaver and you'll eventually come to this occurrence.