Creates arcs of fire between projectiles (requires 2 projectile spells)
Gunpowder Arc
Creates arcs of gunpowder between projectiles (requires 2 projectile spells)
Poison Arc
Creates arcs of poison between projectiles (requires 2 projectile spells)
Electric Arc
Creates arcs of lightning between projectiles (requires 2 projectile spells)
Spells that add damaging arcs between two or more projectiles when cast together.
Electric Arc is a projectile modifier that causes projectiles to arc lightning between them, dealing both Explosion and Electricity damage. Unless the spell naturally produces more than one projectile per cast, like Triplicate Bolt, it must be used with a multicast modifier to work.
Tips
This is an extremely dangerous modifier that can wreak absolute havoc. Perks for immunity to both explosion and electrical damage are heavily recommended if there's even a chance you think you'll be hit by this.
Synergizes well with a multicast array of Bubble Spark spells, as they're somewhat slow & very cheap.
Explosion and 
Electricity damage. Unless the spell naturally produces more than one projectile per cast, like Triplicate Bolt, it must be used with a multicast modifier to work.
