Shadeydm said:
Well I am hoping to run a d20 CoC/DG at some future date. The problem is I pretty much agree that d20 modern is better than CoC d20. But I love the CoC and DG materials and don't really have time or inclination to try and stat it all out in d20 Modern. Having finally gotten a copy of DG I must confess I am totally hooked on this book. It seems to me an ideal blend of CoC, Milennium, and the X-files. My biggest problem with the system is the whole character creation process being limited to defensive/offensive option. Compared to d20 modern with its strong, fast, tough, smart and dedicated classes plus advanced classes its just no contest to me. ARRG!
d20 CoC is at least 95% compatible with d20 Modern, so my advice is... use d20 Modern with d20 CoC materials. Let the players create Modern characters, create any new NPCs you need with the Modern rules, and use published monsters and NPCs from the d20 CoC rules. Use d20 CoC for monsters, possibly spells, and flavor, and d20 Modern for the rest. I assume you have both the Modern and CoC books to be commenting on them thus, so there's no additional expense involved.
The magic systems in the core books are the only things that would cause a conflict and are grafted on in both cases; you can safely exchange the two without worry. Alternately, there are some very nice alternatives (EN Publishing's Elements of Magic and RPG Objects' Legends of Sorcery leap to mind) that could be fairly easily tweaked for appropriate Cthulhosity.
(BTW, is Delta Green d20 out? I haven't seen a copy yet. Anyway, I doubt it's much different from d20 CoC in terms of compatibility.)
The only other thing you would need to watch out for is the somewhat greater survivability of Modern characters. In general, d20 CoC characters are, on a per-level basis, equivalent to or slightly weaker than d20 Modern ordinaries, so keep that in mind if there's a reccomended level or CR involved.
If the Modern PCs are too tough for your Mythos campaign (keeping in mind that the Call of Cthulhu
game does not necessarily reflect the number and quality of physical victories of characters in Lovecraft's
fiction), consider slowing their advancement or capping their hp, but I don't even think that will prove too much of a problem.