True Banishment

You attempt to banish one creature within the spell's range from the world you're on. That creature must make a Charisma saving throw. On a failed save, the creature becomes banished from the plane you are on, disappearing with a faint popping noise. The creature will be sent back to its home plane, and if it's on its home plane, it will be sent to a random plane adjacent to the one you're on. A banished creature can't go to the plane it's banished from by any means. Planar travels and other forms of teleportation fail to bring the creature to that plane. Portals leading to the banished plane appear distorted and gray to the creature, and the creature can't see into the plane through any form of magic or scrying sensors.

This spell can only be dispelled if dispel magic is successfully cast while the caster is in the plane the creature was banished from. Other spells such as wish and remove curse fail to end this spell.

If you cast this spell on a creature while you're on its native plane, the creature has advantage on the saving throw. If you cast this spell on a creature whose native plane is opposite to the one you're on, it has disadvantage on the saving throw. A creature can't be affected by more than 3 instances of this spell.