I wouldn't be so quick to dismiss the non human races. A teifling for example would need to be more human looking, but would otherwise fit right in. Merlin himself was supposed to be half-demon remember. Likewise half-elves make perfect sense as changelings. Maybe halflings are pictish woad warriors, and half-orcs as brutish viking raiders. Just shift the images 4 pts towards human and call it good.
Hrmm interesting thought. I know I want to keep them "somewhat" still in the game, just not prominent.
Maybe I will give them a new paint job and keep some of them in. I think though, if a player decides to make a non human they will have to keep their identity as hidden as possible.
I'd need some more information before I'd give advice.
You said that there would be some magic, but I'm unsure of these aspects:
1) Is there going to be a feywilde/avalon or shadowfell/purgatory/sheol/hades? Is there a hell? Will you be following Christian Cosmology, Celtic Cosmology, or is it going to be a strictly physical universe?
Yes?
A more detailed answer is harder to give as I'm sort of the type of DM that goes with (deal with it when I get to it.)
In theory I want places like the feywilde and such to exist? Just not sure how/if I'll use them yet.
2) Is magic rare, weak or hidden?
All of the above kind of?
I want magic to be mostly in the form of Artifacts and Rituals. (The game terms.)
Thats the main reason for cutting the power sources down to martial only. Doing something actually physically impossible, but cinematically cool? Fine... Commonly able to creat a giant fireball... doesn't really fit what I'm going for.
Yes- but again like magic it's rare, and not seen that often. (Although talked about in many superstitions and such.)
I think obviously the PCs will have interactions with monsters on a far more common base then the average person.
Use the inherent bonus from the CB when building characters, this will fix the math issues and allow for some nice rare magic artefacts to be introduced.
I forgot they added those... They're just bonuses the CB applies in place of magic items correct?
Thats kind of the plan... The "Magic Items" of this campaign would be artifacts modeled on artifacts in the real world.
I'd also allow - at DM discretion for each one - multiclass feats for classes in other power sources, but make them roleplay for it; I mean is they want to cast a wizards spell they will have to track down an mage to learn from and they might get some religious inquisitors on their case. Also if they start displaying miracle like powers expect some attention from nobles and the church.
Not sure I want a lot of the other power sources popping up... Even in the form of multiclass feats.
That said I'm also not the type of DM that feels that once I "ban" something from the game it's gone for good. If someone really wants to do something, and has a cool idea for a character, they can talk to me about it.