Delayed Lightning Bolt

A beam of blue electricity flashes from your pointing finger, then condenses to linger at a chosen point within range as a crackling bead for the duration. When the spell ends, either because your concentration is broken or because you decide to end it, the bead roars with a crackling blast of lightning in a line. Each creature in a 100 feet long and 10-foot wide line centered on that point must make a Dexterity saving throw. A creature takes Lightning damage equal to the total accumulated damage on a failed save, or half as much damage on a successful one.

The spell's base damage is 12d6. If at the end of your turn the bead has not yet detonated, the damage increases by 1d6.

If the crackling bead is touched before the interval has expired, the creature touching it must make a Dexterity saving throw. On a failed save, the spell ends immediately, causing the bead to strike in crackling Lightning in the direction it is pointed in. On a successful save, the creature can throw the bead up to 40 feet. When it strikes a creature or a solid object, the spell ends, and the bead explodes in an electric streak in a random direction.

To determine the random direction, roll 1d8 to determine what direction it blasts in a 360 direction where 1 is the direction it was thrown in. 1 is 0-45 degrees, 2 is 45-90 degrees, 3 is 90-135 degrees, 4 is 135-180 degrees, 5 is 180-225 degrees, 6 is 225-270 degrees, 7 is 270-315 degrees and 8 is 315-360 degrees. (Either the caster or the thrower may roll this die)

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the base damage increases by 1d6 for each slot level above 7th.