Varvain's Vault

You conjure an extradimensional vault within range for the duration. You choose where it's entrance is located. The entrance shimmers faintly and is 10 feet wide and 10 feet tall. You are the only creature who can enter the vault as long as the entrance remains. 

Beyond the door is a 15 foot by 15 foot storage vault for you to keep your riches. Inside the vault are 2 unseen servants waiting to help you retrieve any items you may need. They are not capable of traveling more than 5 feet out the vault door. When the spell ends if you are still inside you are shunted out to the nearest available space where the vault door originated. Each time you cast this spell all of the contents are where you left them and your servants know exactly where everything is located.