Shelter

It's not a pleasant truth, but your kingdom will come under attack by greedy pillagers at some point during your reign. It's very likely that your defenses will fail you, especially under repeated siege. To keep your hard-earned goods from being looted, you can place them in your Shelter. The Shelter doesn't add to the space of your Warehouse rather provides temporary storage while your Village is under attack. The higher level your Shelter, the more it will hold.

Function
The Shelter protects a certain percentage of resources, depending on its level, from being looted by an attack party. It does not add to the number of resources the village can store. It requires the Warehouse to be upgraded to level 3 before it becomes available.