Arcbolt grenade

You create a bolt of lightning that arcs toward a target of your choice that you can see within range. chains bolts of lightning to nearby targets, and applys jolt

A target must make a Constitution saving throw, or be jolted

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, one additional bolt leaps from the first target to another target for each slot level above 6th.