You do realize that part of the GMs job is to prevent players from abusing the system to break the game? In the case of the person who did this, it did not break the game because wielding a glorified toothpick would have had an equal impact on his game. My games, and I suspect many others as well, would have thier games severly impacted by the ability to bind greater deamons willy nillly. I do not let my players break the game and if they try they will face the concequences… With will be more interesting than "rocks fall you die." If your games would not be broken by such things, or if you and your players would not get bored after realizing the only thing in the universe more powerful than them are gods, more power to you, have fun your way. In my games greater deamons are powerful and terrifying entities that would likely have aranged your death long before you even had a chance to stuff it in a sword, they are proactive forces. They are not reactive obstacles that wait for people to stuff them in swords. My players expect to be part of a proactive universe that does its own thing until they affect it. They are smart enough not to screw with things they cant handle. If you think that having a being one step removed from godhood actually able to defennd itself is unusually punitive, then I am glad we do not play together.
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.
First, you need to stop making assumptions about others. Without specific context you are litterally not qualified to pass judgement on me, my players or how we play. Get over yourself. Other than saying that, Im ignoring your first paragraph.
As to your second: you are again making assumptions. I did not say it would be impossible. I gave examples of the consequences of trying. If the players can face them and win, then the blood, sweat, and scars say they can. The post of mind that you quoted starting this was infact talking about the consequences of someone succeeding, and how it would be alot like holding on to the tigers tail. I would never enjoy the happy-go-lucky version of the grimdark, where no one has to face the consequenses of what they do. Yeah players might have the chance to be the badasses of the grimdark, but unless they can actually take all comers, and out wit the gods themselves they will never be at the top. And no, black crusade does not (yet) take the players to the level oc power Abbadon enjoys. The entirety of the screaming vortex doesn't even contain a fracton of the forces at his command. Maybe in a future supplament, one where the players can command all the forces of chaos and bear all 4 marks of chaos at the same time the game will, but right now, that idea is laughable. Have you never heard the phrase, "there is always bigger fish." And as long as the players are still mortal, they will not be nearly as valuable as you seem to think, not in any version of the grimdark that I have ever heard of, chaos is kind of like that. Maybe when they have rules for becoming a deamon prince. But then I think it is clear that you and I play in very different versions of the grimdark, and we wont reconcile this between us, so I think Im just going to ignore you from now on and get back to watching my players overcome things you would apparently cry about before running away.