[NoviLigure]

Good question.
Assuming you are counting homosexuals and feminazis as "dark creatures" and not the unfortunately led astray "DragonSlaves" It is very easy for one to slay them.


One would simply declare they wish to attack the monster, roll a dice (or in this case pick a number from a hat) and add that number to the number assigned to your weapon of choice, like a sword. The monster does the same, and whoever ends up with the higher number wins that round of combat and begins to defeat the other. The idea of slaying heathens in the name of God should be more than enough to warrant some interest. I know it is for me, at least.
Simple as that!