Vestige of Mount Vaelis

You call upon the thunderous voices of triumph from ancient heroes. Choose one creature that you can see in range. The target must make a Dexterity saving throw. The target takes 2d8 thunder damage on a failed save, or half damage on a success. Additionally, until the end of your next turn, the target's movement speed is reduced to 0.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.