Torturous droplet

You summon and fling a single drop of water at high velocity. On hit the target the target takes 1d10 piercing damage. If you target a creature that you hit in your previous turn, you may attempt to hit the exact same spot on the creature the droplet hit previously, causing tremendous pain. When you choose to so you suffer -5 penalty to the attack roll,  but if you score a hit the target gains 1 pain and you deal damage equal to the targets pain plus your spell casting modifier.