Quicksand

3rd-level transmutation
Spell Lists: Druid, Ranger, Sorcerer, Wizard
Casting Time: 1 action
Range: 60 feet
Components: V, S, M (a pinch of sand)
Duration: Concentration, up to 1 minute

You cause the ground in a 20-foot radius centered on a point you can see to turn to quicksand for the duration of the spell. A creature moving through or out of the area must spend 4 feet of movement for every 1 foot it moves. A creature that ends their turn must make a Strength saving throw. On failure, they fall prone.