JeffB said:
However, Im really curious why people want rules for these sorts of things. Rules for selling your soul? For sacrifice? (what, does the evil cultist score an automatic crit because the victim is bound? what kind of rules are needed here?) I could see rules for drugs themselves, but not drug-use...Ok...make your will save..Oh no..your addicted!How hard is that to figure out? Do the demon lords/princes show up enough in people's games that they need to know what there BAB cross clas skills and AC are? Are your players fighting these guys?
Let me explain what I expect from the book (whether it is actually what I get or not is another matter entirely...)
On the subject of sacrifices, for example : I like villains who do sacrifices. Well, like is not the word. I find them interesting antagonists for the PCs. First of all beacuse it's vile. Second because it usually puts the PCs in situations and confrontations when they need to wipe out some participants while protecting others. Always more interesting than a straight-ahead fight.
Now in the actual D&D rules, there is no need and no gain from sacrificing anyone to your deity. So why would evil cults do it ? Why would mad wizards do it ?
Similarly, NPCs who make pacts with evil entities are a classic of RPGing. What are the mechanics for this ? It would be nice to know.
In my current campaign, the PCs will be confronted to a resurgence of an evil devil cult. I think if the book is done well, I might pick quite a few ideas from this.
Now you may be right in saying that DMs could invent these things themselves. I agree with this, but DMs could design their monsters, game worlds, PrCs and everything else as well. WHy do we need these rules ? Because we're too lazy to design them ourselves, and because it's nice to have a common set of rules for elements that may appear relatively frequently in RPG plots.
As for the arch-devils and arch-demons stats, you might as well ask : why did they releases "Deities and Demigods". I myself didn't get it because I have no need for stats of gods. Similarly, I have no need for stats of arch-ds. But then again, there's much stuff in most RPG books I purchase that I don't need...