Traenin's Crackling Net

Making a inverted triangle with your fingers, a sparking blast of electricity forms, casting outwards. Each creature within a 10 feet cone must make a Constitution saving throw. A creature takes 3d6 lightning damage on a failed save, half as much on a successful one.

When cast in water, the blast of electricity becomes a net, spreading out to 20 feet in front of the caster in a cone. Enemies must make a Constitution saving throw at disadvantage, taking 3d6 lightning damage on a failed save, or half as much on a successful one. The caster gains immunity to lightning damage until the end of the turn.

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.