Cryhavok said:
I think that if your players are ‘abusing’ rules you should sit down and have a talk with them, not passive-aggressively punish them in game. That’s pretty much the definition of petty, vindictive GMing. Any given player is as much responsible for maintaining the game as a social activity as the GM; acting like it’s your own personal tin-pot dictatorship is a sure sign to get any sane players to bolt away from your table like a cat in an earthquake.
If you really want to enforce the idea that Greater Demons are impossible for players to bind in demon weapons, than why do you suppose that rules for such a thing exist? I think you underestimate the amount of power that PC’s in Black Crusade are supposed to wield, eventually. Sooner or later they will become favored servants of the dark gods, valued even more than Greater Demons. The game basically has rules for going up to Abaddon’s level. Think about that for a bit. It’s not supposed to be ‘PC’s helpless against any meaningful NPC.’ They’re supposed to be able to triumph over enemies like this. It’s a matter, in part, of how much they will have to sin and sacrifice to get what they most desire.