In a word: brilliant. Regardless of what your own campaign might look like, there are things in here which can be dropped in to make life more interesting for your players. Some highlights for me:
- The new PC races. I love them, especially the White Ape (which fits perfectly into my campaign). Seriously, all of them have already been placed in my campaign world — hopefully in places my players will be exploring soon.
- The Random Artifact tables are awesome. Not only is this right up my alley (I love random tables), it makes magic items dangerous. I also got a real kick out of this aside:
This way, even if the players own a copy of this book, their characters can never be certain what the odd object’s powers and, more importantly, drawbacks are.
- The simple take on Psionics that is completely compatible with Mutant Future.
- A new magic spell category called Formulae which cobbles together magic and alchemy to produce substances and effects.
- Rules on reading eldritch tomes.
However, one of the things I truly appreciated about this work is the introduction. It brilliantly summarizes HPL's "cosmicism" into six themes that characterize his work. In addition, there are suggestions on how to apply each to any given campaign.
Now, for those of you who have already read RCC and are familiar with my own campaign style with its inclusion of religious themes, you might be wondering why I would appreciate things like The Insignificance of Man, An Uncaring Natural World, and The Reality of Man as an Animal.
The reason is quite simple, actually. Cosmicism, especially as defined in RCC, perfectly expresses what is left when we get rid of God. The abject horror of a world sans God is marvelously expressed in the work of HPL, and in the themes of an RCC campaign. For me, this is a excellent foil for my own themes. It sharpens the realty of our choices and the consequences of these choices.
So, if you haven't already gone out and bought it, I highly recommend RCC.