Arc Blade

You brandish the weapon used in the spell's casting and make a melee attack with it against one creature within 5' of you. On a hit, the target suffers the weapon attack's normal effects, and you can cause a blue spark of lighting to leap from the target to a different creature of your choice that you can see within 5 feet of it. The second creature takes electric damage equal to your spellcasting ability modifier.
This spell's damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d8 electric damage to the target on a hit, and the electric damage to the second creature increases to 1d8 + your spellcasting ability modifier. Both damage rolls increase by 1d8 at 11th level (2d8 and 2d8) and 17th level (3d8 and 3d8).
You can use 1 mana to spread the electric damage to a third creature.

Material Components:Somatic, Material (Any melee weapon made of a conductive material or Metallon in origin)
Related Element: Electric
Effect Duration: Instantaneous
Effect Casting Time: 1 Action
Range: 5'
Manacost 0
Source: Warlock, Wizard (Electric)