I should disclaimer this with saying that I have very little experience with working with NWN.  However, I am a pretty quick learner and have slowly been teaching myself to change various things around how I like them (Soulknife with full +1 BAB!  Yay!).  I'm at the point where I'd like to undertake a larger project, namely the creation of a custom class.  However, before I can begin, I need to know whether a couple things are even possible, relating to Domains (something I don't understand the functionality behind very well).

Firstly, is it possible to add "domains" that are a ) Not selectable as cleric domains, b ) Do not give any domain powers, just domain spells, and c ) otherwise identical to the base domains?  Would it just be a matter of duplicating the feat for the domain and removing some code from it?

Secondly, would it be possible to cleanly remove such a domain?  In other words, remove all of the domain spells granted by that domain from the character?

Thirdly, could such a domain be easily swapped at level up for the "full" version of the domain?  i.e., swap out the "spells only" version of the Strength Domain for a full-featured version?

Fourthly, is it possible to modify a character's spells per level per day based on the number of Domains they have?  Er... and by "possible" I mean "reasonably implementable without a highly complicated workaround".  XD

And finally, it there anything preventing a character from having more than two domains?

I recognize that I am probably biting off more than I can chew, but I've found that with modding projects, it's often best to start ambitious.    And with answers to these questions I could at least figure out if the class I am trying to create is even physically possible to implement in NWN.  ^^;

Thanks in advance for any help.

Oh, and if it would help clarify exactly what I am trying to accomplish, I can post the full writeup for the class if anyone wants to see it.

Would also like to note that I would be very, very interested in seeing a PRC-using persistent world.  I'd be glad to offer my help in any way I can to make it happen.  Unfortunately, I don't have much in the way of needed skills; like I mentioned earlier, I couldn't even figure out how to make a proper merge hak.  ^^;  And I have no real experience with the toolset...

But I'm certainly willing to try and learn if there is something I can help with.

What I mean is there was a dialog menu like Duskblades/Psions/etc get for choosing their spells, except it only said "You'll be able to choose more spells when you next gain a level", and no matter how many times a clicked "End Dialog" it wouldn't go away.  And I didn't seem to gain any spells, except the one time it actually let me choose spells, and then I had to manually choose every spell I had available at the time.

Are you sure the Dread Necro stops at 20?  I see feats listed for epic levels in the manual...  Even if they can't, you can take Practiced Spellcaster to have your first 4 levels of Lich add to your caster level and that will easily get you into Demilichdom.

Anyway, you've spiked my interest, so tomorrow I'm gonna level a Dread Necro up to 20+ and test out Dread Necro/Lich and how the Dread Necro Lichdom works.  Will report back after testing.

Figured out what it was with Keen.  I feel like an idiot.  ^^;  Didn't realize I had to have the spell prepared, not just know it...

Thanks for the reply.  Oh, well, I guess scrolls it is.  Might be helpful to have something explaining that drawback in the Cerebremancer description?  And I still can't craft weapons with Keen now, even as a Wizard 5/Psion 4/Cerebremancer 3...  I'm very tempted to turn on arbitrary crafting; it's horribly overpowered, but I'm finding myself frustrated by the extremely strict limits on crafting (I specialized in Evocation so I can never craft any Bane weapons?  No way to add elemental damage/bonus damage/massive criticals to weapons at all?).  I recognize these are probably PnP limits, but it feels like I have to choose between extremely limited crafting, or extremely overpowered crafting.

I suppose that does make sense for Dragon Disciple...  Is it intentional that you specifically need Dragontouched to take Dragon Heritage, though, and not just the dragonblooded subtype?

My friend and I are going through Shadows of Undrentide together, him as a Silverbrow Paladin/Dragon Devotee/Vassal of Bahamut and me as a Kalashtar Psion/Wizard/Cerebremancer.  It's really quite a lot of fun and we're having a blast, but lately I've been noticing some oddness with the Cerebremancer and I'm wondering if it's working as intented of if there is some kind of weird bug.

First off, my level is currently Wizard 5/Psion 3/Cerebremancer 2.  I just took Craft Magic Arms and Armor, and earlier I took Practiced Spellcaster (Wizard).  Eager to try it out, I grabbed my friend's main weapon (the Tinnoman's Sword) and buffed it up to a +3 weapon, which worked just fine.  However, I was unable to add Keen to the weapon, despite knowing the Keen Edge spell and having enough gold and XP.  Does Cerebremancer  not add to your caster level?  I should be caster level 10, sholdn't I?

The second thing I've noticed is that I don't seem to gain new Wizard spells upon gaining a level of Cerebremancer.  I gain new spells per day, power points, and powers just fine, but I have to use the "buy any scroll you want" PRC menu to learn new spells (Unrelated side note: That shop is a mess; would it be at all possible to divide it into separate shops based on spell class and level?), which feels a little bit like cheating.  Is this intentional?  And if it applies to Sorcerors as well, how the heck are they supposed to learn new spells as a Cerebremancer?

Anyway, these two issues aside, I want to say that the PRC is a simply amazing upgrade to NWN that I really can't play without anymore.  I even have a hard time playing NWN2; even though I consider it a better game than NWN, I just can't live without all the new features from the PRC.  

Oh!  Almost forgot to mention the one issue my friend had with his character.  Despite Silverbrow Human claiming to give the dragonblooded subtype, taking Dragon Heritage(Silver) without Dragontouched causes you to be unable to level.  Is this intentional?  It seems like SIlverbrow Humans shouldn't need to take Dragontouched.  Also, it would be nice if there was a way for Silverbrow Humans and other characters that emphasize their dragon heritage to take Dragon Disciple without needing a level of Sorceror/Bard; my friend had originally wanted to be a Paladin/Dragon Disciple/Vassal of Bahamut but discovered that the combination is impossible due to the three class limit.