Thrashing Devilfish

You call on the tentacled creatures of the sea who's power erupts from the ground within range. 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. On a successful save, the creature takes no damage, but is still knocked prone. The violent appearance of the tentacles turns the affected ground into difficult terrain until cleared, with each 5-foot-diameter portion requiring at least 1 minute to clear by hand.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.