Hephaestus' God Power creates a wondrous, mythical Vault that grants a constant flow of <link="topic:food">Food</link>, <link="topic:wood">Wood</link> and <link="topic:gold">Gold</link>.

To erect the Vault of Plenty, left click on the Plenty icon, then left click where you wish to place the Vault.  The gods favor the strong -- if an enemy has more units or buildings near the vault than you, then you will lose control of the vault and the enemy will get the flow of resources.  Place the Vault carefully, and then defend it well.