There is a great Evil overtaking the land, enslaving the people & ruining all that is good. Fortunately a Hero has emerged to combat the darkness and bring peace back to the country. Unfortunately, our hero is a moron. There's no way he'll succeed unless he has help. That's where you come in. You do not have any influence over the bungling hero. You are not a corporeal being. You are merely a subtle influence on the hero's enemies. By subtle, I mean that you cannot influence them to do anything obviously stupid or self-defeating like commit suicide or step aside for the passing hero. The enemies must still believe that they are fighting for evil, but their actions can be swayed in ways that may seem logical to them when they don't have the full picture, but that inadvertantly help the hero in ways they could not understand with their limited scope. The hero might be trying to sneak into a fortress of darkness for instance, and be about to crash through a window where a hundred armed guards are sleeping. You could help him out by influencing an overseer to stage a suprise drill to keep his troops sharp. The alarm goes off and all the guards conveniently leave the room just in time.