Okay, so let's say you can give each monster a characteristic: if its attack skill is less than or equal to a certain value, you can easily defeat it (the number of such monsters you kill also affects your attack). For example, a demon could have "Requires Attack -1," meaning at level 1, you can defeat one such monster, but only for a post. And for archangels, monsters, etc., you can give them a characteristic like "Can be defeated with an attack skill of 15 (for example)." Then, the higher your level, the more monsters you can defeat. And if your defense is greater than or equal to the monster's attack, you can dodge it (the number of dodges is equal to your defense value), also for a post. That's how it would work...