Eldritch Shockwave

You create a bolt of crackling lightning that arcs toward a target of your choice that you can see within range. Three bolts then leap from that target to as many as three other targets, each of which must be within 30 feet of the first target. If hit, sap 10 HP to heal caster or teammate.

A target must make a Constitution saving throw. The target takes 10d8 lightning damage on a failed save, or three quarters as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, one additional bolt leaps from the first target to another target for each slot level above 1st.