Eldritch Barrage

You shoot a barrage of small eldritch blasts in a 30ft cone making your targets make a dex save or their movement speed is halved on their next turn and they take 2d6 force damage on a failed save and half as much on a successful save.

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.