Ball Lightning

multiprojectile

Multiple Projectile Spells

Ball Lightning

Summons three short range electrical orbs

Flock Of Ducks

Summons a chaotic flock of spicy ducks

Freezing Gaze

A heart-freezingly sinister aura

Intense Concentrated Light

A spectral wand is summoned that casts a huge beam of light

Triplicate Bolt

A formation of three small, fast bolts

Infestation

A bunch of magical sparks that fly in every direction

Summon Fly Swarm

Summons five flies to aid you in battle

Summon Firebug Swarm

Summons four fire bugs to aid you in battle

Summon Wasp Swarm

Summon six wasps to aid you in battle

Spells that create more than one projectile when cast.

lightning

Lightning Spells

Lightning Bolt

The primordial force of nature

Thunder Charge

A projectile with immense stored electricity

Ball Lightning

Summons three short range electrical orbs

Lightning Bounce

Makes a projectile release powerful lightning as it bounces

Thundercloud

Creates a thundercloud

Explosion of Thunder

An electric explosion

Spells which have one or more lightning effects. These are distinct from spells doing Electricity damage, having a Lightning Component.

Ball Lightning is a projectile type spell that creates a short-ranged spread of three naturally piercing spheres of electricity. Each sphere slows rapidly, and travels only a short distance. They are instantly stopped when hitting terrain (though this doesn't make them explode sooner). The combination of piercing and Electricity damage make this an ideal spell for killing many bosses.

Tips

The short range limits the usefulness of the spell, but this can be alleviated with the use of a Trigger spell or Long-Distance Cast to launch the bolts at a distance.
Similar to Lightning Bolt, it's easy to harm yourself when using this spell; be careful when casting it near liquids or metals without the Electricity Immunity or Electricity perk, especially when using it without triggers or other methods of increasing its range.
While the projectiles themselves do not naturally have Friendly Fire, the explosion is still able to damage you naturally and might stun you temporarily upon doing so. This damage can be heavily reduced with Electricity Immunity, Electricity or Gas Blood (which will also remove the electric stun effect) or mitigated completely with Explosion Immunity or Exploding Corpses.
The triple-projectile nature of the spell means that it synergizes well with all modifiers, as each is applied to the bolts separately.
Speed modifiers like Speed Up will not increase the range, but rather shorten the time it takes to reach its maximum range.
Unlike most other spells, the spread from Ball Lightning doesn't apply to other projectiles within the same cast. However, Reduce Spread will still work on Ball Lightning.
Ball Lightning has an innate piercing effect, so a homing modifier significantly increases the damage dealt by the projectiles.
Remove Explosion modifier can't remove its explosion.

Multiple Projectiles

Some spells, including Ball Lightning, produce several projectiles per cast. This property produces useful effects and synergies, and has some caveats to be aware of when used with other spells.

Modifiers that add damage will apply to all of the individual projectiles, multiplying their value.
The Arc modifier spells, particularly Electric Arc, work well since they are more effective when many projectiles are cast together.
Pattern angles set by Formation multicast and other spells can apply to each projectile individually.
Add Trigger will attempt to add a trigger to each individual projectile, using a separate payload for each one.
- Some spells produce a different number of projectiles when combined with Add Trigger.