Conduit

You create an immense static charge centered around a target creature of your choice that you can see within range. Whenever you hit that target with a spell attack, or it fails a saving throw against one of your spells, the influx of magical energy causes a jolt of lightning to spark out to a nearby target of your choice.

The nearby target must be a creature within 10 feet of the original target, and it must make a dexterity saving throw or take 2d8 lightning damage on a failed save, or half damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, one additional nearby enemy can be targeted for each two slot levels above the 1st.