I guess it's sort of a code, but when you have to take the traders to safty (the first time), you can kill one of them without losing the mission. So when yo kill one, you get about 130 evil points. After you kill one, save your hero attributes and kill the other one. You will start the mission over but you will still have the 130 evil points for killing the first trader. (If you want to go faster, you can go to get the wounded trader, and kill HIM and one other trader, if you kill both original traders you will start over)