Static projectile spells that conjure a field of magic that modifies all projectiles that pass through it.
A combined offensive & defensive spell that creates a sparking, magical field at the casting location (melee, unless modified). Any projectile that comes in contact with it, either from the outside or inside, will be transformed into a Lightning Bolt directed away from it.
It's a powerful defensive barrier that can be very hard for enemies to penetrate. You'll still be vulnerable to melee attacks, though, as well as everything else that is not a projectile.