Doomed by Grief

1d10 piercing damage to nearest enemy you can see. On crit the target must survive a dc 10 con save or immediately be lowered to 1 hp and left unconscious. If target is killed or put unconscious by this spell roll damage for the next nearest target within line of sight + X. X = Number of beings killed or left unconscious by this spell

At later levels you get Y. Y being the amount of innocent people killed. You can save up this till you want to use and when you do it will go back down to 0. Say you kill 100 innocent people you then add on to it as the role then this spell will do 100 extra damage.