Electric Field

You begin emitting a crackling field of electricity in a 10-foot-radius sphere, which is centered on you and moves with you. When a creature enters the sphere for the first time on a turn or ends its turn within the sphere, it must make a Dexterity saving throw. On a failed save, it takes 2d4 lightning damage and cannot take reactions until the beginning of its next turn. On a successful save, a creature takes half damage and can take reactions as normal

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 2d4 for each slot level above 1st.