Death Chant

A pall of dread extends out from the caster, the air thickening around and draining creatures in a 20 ft. cone in front of you. Targets in the cone take 1d8 necrotic damage, and on each of your turns for the duration, you can use your action to continue the chant and deal 1d8 necrotic damage to targets in the cone automatically. If a creature starts its turn in the cone, it must make a Strength saving throw, or have its speed reduced by 10ft while within the cone. The spell ends if it is not maintained each turn. 

At Higher Levels. When you cast this spell using a spell slot of 1st level or higher, the initial damage increases by 1d8 for each slot level above 1st.