Blighted Storm

The caster calls fourth a violent storm to strike down their foes. The storm starts with a lightning damage pool of 4d8. Target at least one creature within sight, up to 4 creatures. For each creature targeted after the first, the lightning damage pool is reduced by 1d8. Make a spell attack against each target, with advantage against creatures wearing metal armor. On a hit, the creature takes lightning damage equal to the current pool.

Targeting Examples; 1 creature = 4d8, 2 creatures = 3d8, 3 creatures = 2d8, 4 creatures = 1d8

At Higher Levels: When cast using a spell slot above 2nd, the initial lightning damage pool increases by 1d8 per level.