Terri's Void Strike

Make a ranged spell attack against the target. If the target is within 5 feet of you, you can choose to make a melee spell attack against it instead. On a hit the target makes a Cha saving throw, on a fail they are prone and sent to a harmless demi-plane until they are brought back, on a success they are still sent to the demi-plane but are not prone and can prepare any action they want, and when the spell drops they can immediately use it whether it is someone else's turn or not.

At Higher Levels:

 When you cast this spell using a spell slot of 7th level or higher you can choose which plane the creature is sent to if you have any knowledge of other planes, if not, the spell acts like it normally would but still expends the spell slot.