Dimensional Barrier

For the duration, you ward the area with a dimensional barrier.

Beings that try to move within 200 ft. of yourself by way of teleportation magic (such as through the use of the Misty Step or Teleport spells, or similar magic) are instead prevented from appearing. Portals that lead to other planes of existence within range are suppressed and closed, but not dispelled. 

Beings that try to teleport into or within range must make a Charisma saving throw against your spell save DC, or take 6d6 Force damage, taking half as much damage on a success.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, you may choose up to a number of creatures equal to your proficiency bonus that are able to teleport freely within range. With a spell slot of 8th level or higher, the area affected by this spell is instead 1 mile instead of its normal area.