Storm Arrow

Spell Lists: Sorcerer, Druid
Evocation cantrip
Casting time: 1 action
Range: Self
Components: S, M (a weapon with the ammunition property worth at least 1 sp)
Duration: 1 round
You ready the weapon used in the spell's casting and make a ranged attack with it against a target you can see within the weapon's range. In place of ammunition, a bolt of crackling energy forms along your weapon as you motion to attack. On a hit, the attack deals lightning damage instead of its normal damage type.

If the creature is wearing Metal armor, the damage die of the weapon becomes 1d10.

This spell's damage increases when you reach certain levels. At 5th level, the initial attack deals an extra 1d8 Lightning damage to the target on a hit, or 1d12 if they are wearing metal armor. the bonus damage increase by one die at 11th level (2d8 or 2d12) and again at 17th level (3d8 and 3d12).