Trip

You attempt to foil a creature's movement.

Choose a Medium or smaller sized creature within range that has moved by at least 5ft.  The creature then must make a Strength or Dexterity saving throw (target's choice).  On a failure, the creature is knocked Prone & their walking speed is reduced to 0 until the end of their turn.

A creature that is flying, climbing, tunneling, swimming, or falling is immune to this effect.

At Higher Levels.  When you cast this spell using a spellslot of 2nd or higher, you can target Large sized creatures.  4rd level can target Huge sized creatures and 6th level, Gargantuan sized creatures.