Arcane gate

The caster would pick 2 spots that it could see, the first within 10 feet and the other within 500 feet and create a portal. The portal would have been 10 feet in diameter and can only be seen and accessed by one side. The "ring" would only show "Mist" on its surface and it would also glow. The portal could not be cast on a creature and the portal could also be turned by the will of the caster.