TeliKrystal’s Shattering Shunt

You shatter the fabric of the planes, shattering a small area in the way of a creatures current movement (if stationary then they fall down into it). 

The creature must make a DC Dexterity Saving Throw equal to your Spellcasting saving throw, on a success they dodge the shatter, on a fail they fall into the shatter, where they are flung into the nothingness between realms, they are then forced back through the shatter. Whilst in the nothingness they take damage equal to your saving throw of d20’s. Example: if your saving throw is 15, they take 15d20’s of damage.