Eearth Tremor

Casting Time: 1 action
Range: Self (10-foot radius)
Duration: Instantaneous
You cause a tremor in the ground in a 10-foot
radius. Each creature other than you in that area
must make a Dexterity saving throw. On a failed
save, a creature takes 1d6 bludgeoning damage
and is knocked prone. If the ground in that area
is loose earth or stone, it becomes difficult terrain
until cleared.
See XGE, pg. 155