The conditions for unlocking the grain silo were different from those for the chicken coop, pigpen, and cowshed. The latter required only the presence of the respective animals on Kim Haru's small farm (zombie animals excluded) to automatically unlock the corresponding building options. However, the grain silo required Haru to gather sufficient materials.
A grain silo capable of properly storing food had very high requirements: it needed excellent ventilation to prevent the grain inside from getting damp and molding. At the same time, it had to guard against animals that might steal the grain, such as rats, sparrows, and ants. Naturally, such a silo couldn't be built out of wood.
"Is there any suitable clay in the mountains?" Kim Haru called Go Okrim over to ask.
Unlocking the silo required a significant amount of clay and a small amount of iron.
