By consuming the essence of the Vault, You've gained access to an extra-dimensional storage space!
*It's very, very large. Not matter how long you wander around, you never seem to find a wall.
*Items and living creatures stored here enter a sort of stasis. Anyone on the brink of death will remain on the brink of death, but won't die, fresh food will stay fresh, etc; Wine, fortunately, seems to ignore this rule for whatever reason, so feel free to leave a bottle and come back for it after a couple hundred years.
*You can retrieve items with the merest thought. Where/how they appear depends on their type. Armor will appear over your body, weapons will appear in your hand, etc; All items appear in a burst of harmless golden sparks.
*You can also launch weapons from the vault. The speed they're fired at is variable, but no faster than super-sonic. You can control their trajectory with your thoughts.
*Items will reappear in the vault in their original condition after they collide with something or when you wish it so.