Doors of Janos

You carefully draw a rectangle with a piece of chalk on the wall, imbuing it with your magic for at least one minute . After you do so, a magic gate is opened where the rectangle drawing was. This door leads to a pocket dimension called the "door dimension", and can be closed ore re-opened at any time once you create it. If it is closed, the gate will return to being a mere chalk drawing, but cannot be normally erased and the wall that it is drawn upon gains 5 extra points of AC. If the wall or the drawing are destroyed, the gate permanently closes, and disappears from the "door dimension".

The door dimension is infinite, but every door a caster creates is close to one another, meaning you can easily travel to each and any door you have created as long as they are not destroyed. Passing through a door will re-open it, and it will stay open until someone closes it, as it would be any other door. The door dimension is volatile, however, and if a creature stays on it for longer than 10 minutes, it will begin to be pulled to the closest door, being kicked from the dimension. If the creatures resists for over 3 turns (18 seconds), or there is no door in a 300 ft radius, the creature will then be thrown in a random plane of existance. If a creature is expelled in either of these ways from the dimension, the door is closed permanently and the caster cannot create another door for 3 days. The doors can be drawn in any place or plane of existance, as long as there is a flat surface. You can travel between different planes this way, as long as you have previously created a door on it.