Teeter

Weaving an illusion seen only by the target, you cause a creature to percieve the world spinning around them, as if rotated by an unseen force. Choose a creature on a surface within range. The creature must succeed on an Dexterity saving throw, or lose their balance and be knocked prone, sliding in a straight line up to 20 feet in a direction of your choosing.

If this movement would cause the target to fall off a ledge or otherwise pass through an obviously dangerous obstacle, such as a fire or a pool of acid, it can make a Strength or Dexterity saving throw against your spellcasting DC to end the effects of the spell before reaching the threat, stopping within the closest unoccupied space. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you can target an additional creature for each level above 1st.