Teleportation Sentinel

Level 15

A creature that tries to use teleportation or planar travel to enter a space within 100 feet of you must make a DC 17 Charisma saving throw. On a failed save, you become aware of the attempt and may change the creature's destination; instead of the creature's intended destination, it appears in the nearest unoccupied space next to you. On a successful save, the teleportation or planar travel works normally.