Chain-Lightning Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise the spell fails. On a hit, the target suffers the attack’s normal effects, and lightning leaps from the target to a different creature of your choice that you can see within 5 feet of it. The second creature takes lightning damage equal to your spellcasting ability modifier.

Any creature wearing metal armor takes double damage from any lightning damage done by this spell.

This spell’s damage as well as the number of creatures affected by the extra lightning increases when you reach higher levels. At 5th level, the melee attack deals an extra 1d6 lightning damage to the target, and the extra lightning damage can jump to two different creatures within 5 feet of any creatures affected by this spell. The effects of this spell increase at 11th and 17th level, each level increasing the added lightning damage to the melee attack by 1d6 and the number of different creatures that the lightning can jump to is increased by 1.