Dimensional Link

As you cast the spell, you draw a door frame that is 5 feet wide and 10 feet tall on a solid flat surface and decorate it with sigils unique to you. The drawing is nearly invisible and requires a successful Intelligence check against your spell save DC to be found. Any time thereafter when you create an extra dimensional space a door appears within that space on a flat surface of your choice. You are able to open or close this door if you are within 30ft of it. If someone other than you attempts to open the door, it opens to a solid wall. When you open the door you choose to which frame it opens. You can not reenter the frame created by this spell. You may have a number of links equal to your spellcasting ability modifier, a minimum of 1. If you cast this spell when you already have the maximum number of links active, your oldest link dissipates.