
If you’ve ventured into the enchanting Casterfell Woods while exploring Atomfall, you’ve likely encountered the enigmatic herbalist Mother Jago and the imposing Castle Ruins situated within the Druid’s Camp. While this area is teeming with aggressive Druids, it also offers a wealth of treasures, including access to the locked Castle Grounds Hut.
To unlock the potential loot stored within, you will need the Castle Grounds Hut Key. Below, we detail where to locate and how to use the Castle Grounds Hut Key in Atomfall.
Locating and Utilizing the Castle Grounds Hut Key
The Castle Grounds Hut Key can be discovered on a corpse near Datlow Hall in Casterfell Woods. However, to reach this corpse, you’ll navigate through a particularly hazardous and infectious area.

Your journey begins at the locked garage adjacent to Datlow Hall’s Conservatory, where a dilapidated car is parked. Look closely for a narrow gap between the garage and the vehicle; this is your entry point. Once squeezed through, proceed uphill to discover the infectious area just ahead.

To traverse this treacherous zone, it’s advisable to carry some Painkillers or a bottle of Strange Tonic, and ensure that your health points (HP) are maximized. With Painkillers offering a defensive advantage or Strange Tonic granting infection resistance, you will be able to sprint towards the corpse, retrieve the key, and exit swiftly.

As you navigate the infectious area, you can disregard the scientist’s corpse at the entrance. Instead, veer to the right where you’ll find an alcove containing the Druid’s corpse from which you can loot the Castle Grounds Hut Key.
Once equipped with the Castle Grounds Hut Key, your next destination is the Druid’s Camp located to the south within Casterfell Woods. Here, you will discover the Castle Grounds Hut positioned just left of the grand entrance to the Castle Ruins.

Inside the Castle Grounds Hut, a trove of resources awaits you, including crafting materials, food provisions, and a BARD Crate that contains a Training Stimulant, poison, and ammunition.
Explore further into Atomfall by discovering the locations of the Site Office Key, Crane Controls Keycard, and Greenhouse Hut Key for even more valuable gameplay insights.
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