The Secure Dual Vault is the final Vault Room a Group can purchase out of the seven (7) Vault Room sizes available. The Secure Dual Vault measures 5x5 grids and has a cost of 9,000,000 Prestige. This room allows one (1) Battery Base Item to provide backup power. Two (2) Item of Power Base Items can be placed in this room. Eight (8) Defensive Base Items can be placed in this room.