1. Get the tool you need
- Reach the prison with a Small Key and the Prison Key.
- Near your prison entry stairs, take the adjacent staircase down another level.
- Go through the lower door and collect the Pickaxe. Watch for skeleton archers.
- Equip the Pickaxe before heading back to the yellow piles.
See the Pickaxe location guide for the entire route from the main hall.
2. Identify and break a Goo Pile
- Start with the yellow mound you can see in a blocked prison passage, or return to the sewers.
- Point at the Goo Pile itself. It looks like yellow goo or a bright mound, not an ordinary rock pile.
- Hit it with the Pickaxe until it breaks.
- Pick up the Clay and anything else that drops.
- Continue along other blocked passages and repeat. Do not rely on every pile providing the same amount of Clay.
3. Spend Clay on the right station
| Craftable item | Ingredients | Use |
|---|---|---|
| Oven | 5 Clay + 1 Grate | Bake recipes that use the Oven |
| Smelter | 5 Clay + 5 Scrap Metal | Camp metal-processing station |
| Water Pot | 4 Clay + 1 Iron Rod | Water storage/handling at camp |
To build one, return to hand Crafting, select the station and confirm you have the other ingredient as well as the Clay.
4. Don't confuse the two smelters
- For early keys, use the large Big Smelter already built beneath the main hall; it needs molds, Coal and Scrap Metal.
- For a craftable camp Smelter, collect 5 Clay and 5 Scrap Metal and make it from the Crafting menu.
- If you are stuck trying to enter the prison, stop farming Clay for a new Smelter. You can already cast the required keys at the dungeon's machine.
Wrong tool? The Hammer breaks rusty bars; the Pickaxe breaks yellow Goo Piles. A locked door still needs its key.