Behemoth Stampede (EFA - B)

You summon a thundering herd of massive woolly beasts that stampede through an area then disappear. Choose a point you can see within range. Each creatures in a 20-foot-radius sphere centered on that point must succeed on a Constitution saving throw or be knocked prone. In addition, each creature within the radius must make a Dexterity saving throw, taking  5d6 bludgeoning damage on a failed save, or half as much damage on a successful one. Prone creatures have disadvantage on this saving throw.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.