Rat Nest
Map: Rat Nest

Rat Nest connects to both Fangroot Forest and Hollowgrave Tunnels. Leaving through the forest entrance can return you to the eastern starting area. Begin with the accessible passages and rubbish piles: the northern section contains potions, an Empty Flask, Leather Boots, and Lockpick Tools beside a Rusty Sword. Bring the ordinary pickaxe from the tunnels for the rockfalls.
The Iron Moss Key and Rat Queen
An Underfang in the east carries the Iron Moss Key. It opens the chest containing an Amulet of Freezing, Potion of Cure Poison, Potion of Stamina and two Potion of Minor Healing. A chest near the centre also holds Bloodletter.
The Rat Queen, Mother of the Warren, waits in the south-east with a large group of Underfangs. The queen has 230 HP and fifteen Underfangs with her; we have not confirmed a precise combat sequence. Rubbish near her position contains a Scale Helmet, food, a mana potion and Barlo's Doll. Keep the doll for your return to the village. Nearby are hidden covered pits, a Mindwell Elixir and the recipe for Ghoststep Draught.
The doll and a return visit
Barlo in the village offers Rag Doll Run. Accepting it opens a secret wall in the east of the nest. The quest also talks about a Cursed Doll; we have not confirmed that it is the same item as Barlo's Doll. Keep either item you find and speak to Barlo.
In the south, an alcove holds Spiritweave Gloves, with more food nearby. The gold vein specifically calls for a Golden Chisel; the ordinary pickaxe is not a substitute. When you leave, choose the exit for your destination: north on the map for Fangroot Forest, south for Hollowgrave Tunnels.
