Abyssal Spikes

Invoking energy from the hellish landscapes of the Lower Planes, abyssal spikes erupt in a 15-foot cube centered on a grounded creature you can see within range. Each creature in that area must make a Dexterity saving throw. On a failed save, it takes 3d8 piercing damage and has its speed halved until the end of its turn. On a successful save, it takes half as much damage, but suffers no other effect.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target one additional creature for each slot level above 3rd. A creature in the area of more than one spike eruption is affected only once.