Ahmet'kar's Contract Space

Choose two points on the ground that you can see, one point within 10 feet of you and one point within 1 mile of you. You twist space and connect the two points, opening a tunnel with a radius of 10ft. Casting the spell makes a very loud crackling noise, and the tunnel, while only directly visible when facing the openings, is noticeable form every direction.

Any creature walking through the tunnel is able to immediately step out at the opposite end. Teleportation-based spells do not work for the purposes of crossing the tunnel. If the spell ends when a creature is halfway through the tunnel, the creature makes  a Dexterity saving throw against your spells save DC, taking 4d10 force damage on a failure and half damage on a success. If a creature takes damage this way, roll a d10. On a 5 or below, the creature is pushed back 15 ft, on a 6 or above the creature is pushed forward 15 ft, succesfully crossing the portal.