The vault is indestructible but can be captured by enemy units as it is controlled by whoever has the most military units in the area. Because of this, it is better to place the vault in a well defended area in order to prevent an enemy to get the advantage of the vault. It is useful since it does the work of several villagers so frees up some population space. In addition resources are usually running low by the Mythic Age and the Plenty Vault generates an infinite amount of resources.
Appearances in random maps Edit
The vault has a key role in the King of the Hill and Silk Road random maps. Those also generate resources to whichever player holds onto them but the trickle is much lower (about 1 food, 1 wood, and 1 gold per second). In the former, players can capture a vault located at the center of the map and hold onto it for 8 minutes. Doing so will secure the player an automatic victory. In the latter, there are several vaults scattered across the map that players can capture but those only generate resources.