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 , then the lightning leaps from the target to a different creature of your choice that you can see within 10 feet of it. The second creature takes Lightning damage equal to your spellcasting ability modifier.

This spell’s damage, and the number of creatures that the lightning leaps to increases when you reach higher levels. At 5th level, the melee attack and the chain lightning deal an extra 1d8 lightning damage, and you can cause the lightning damage to then leap to 2 creatures instead of just one. The damage roll for the lightning damage dealt to the initial target increases by 1d8 and the number of creatures that you can target with the chained lightning increases by 1 at 11th level and 17th level. The chain lightning can leap from any creatures targeted by this spell.