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13

The Laundry setting by Charles Stross has deep ones (BLUE HADES). They are known about and the occult community has contact with them. Some organisation recruit BLUE HADES hybrids to work alongside human minders. They are signatories of the Benthic treaty which govern the human/muthos interactions with other sentient races on Earth. Of course, I do not ...


13

The below is written on wizards.com under the d20 System Trademark FAQ: Q: What parts of Call of Cthulhu and Wheel of Time are Open Game Content? A: No part of these games is Open Game Content. This is a definite no. However, bits of relevant open content can be gathered from a number of places: Sanity rules from the d20srd.org wiki, as ...


11

Call of Cthulhu is being given its first real overhaul in decades. The system is d100, and the emphasis is on immersion in the game world. The default setting is the 1920s, but there are expansion materials available for other eras. Chaosium has created an extensive body of well-regarded CoC adventures over many years. Here's co-creator Sandy Peterson ...


11

You're going to trivialize stuff intended for lower levels, except in the case of failure. The particularly worrysome one would be something like traps, where the consequences of failure are based on HP and saves (both of which you didn't scale up). To provide any chance of failure to find/disarm a trap for a character with level 10 skills, you're going to ...


10

Fundamentally, you'll remove opportunities for advancement on the skill side of the character up to level 10. This will make combat, saves and feats the only options for expanding capability through the game. It will also make your players ability to predict the game at character creation even more important than usual. The biggest benefit to the game is ...


8

Another unofficial take on the Cthulhu Mythos would be CthulhuTech. It's set in 2085 and here's the blurb from the product: Humanity faces extinction. Alien insects from the edge of our solar system, long hidden behind the fa├žade of reality, descend to enslave us. Hordes of unspeakable horrors roll out from Central Asia, laying waste to anything in ...


6

You would break things. Many prestige class prerequisites, for example, are based on a number of ranks required in a certain skill, without it you'd be looking at PCs with level-inappropriate abilities and abilities that display erratic behavior. Balance aside, you'd be cutting away a significant portion of what you gain from level-ups, and level-ups are a ...


6

As noted above, the present defining text of the Mythos in the present day is Stross' Laundry series, and the associated RPG. Delta Green has already been noted, though excellent as it is, it's definitely a product of its time. Also a product of its time is SJGames'GURPS Cthulhupunk, a mashup of the GURPS Cyberworld setting+Cthulhu. I forget the details ...


5

There is a True20 treatment of the Mythos entitled Shadows of Cthulhu Dennis Detwiller adapted the One-Roll Engine to the Mythos in Nemesis Delta Green will have its own system at some point, as well.


5

Heroes of Horror has Taint rules. They’re not automatically associated with spellcasting (outside of specific spells added by Heroes of Horror), but they could be. I don’t recommend that you do, however. The Taint rules are pretty bad. They’re complicated, and utterly debilitating in even small amounts, unless you use a couple of tricks ...


4

I don't know CoC d20, but I do know the BRP version. In it, most of the spells are not useful in combat; they are used outside of combat to summon monsters, banish things and so on. Therefore, you could leave 3.5s magic system alone, and have a separate 'ritual' system using the CoC spells. 4e rituals could be a guide; anyone can use them, but they have ...


4

As far as I know, no part of Call of Cthulhu d20 was released under OGL, therefore, no official SRD exists. As per Wikipedia, The d20 version of the game is no longer supported by Wizards as per their contract with Chaosium. Chaosium included d20 stats as an appendix in three releases, but have since dropped the "dual stat" idea. That is the most ...


3

There are sanity rules for a Call of Cthulhu themed campaign which can be found here. This is something less official but could be helpful so here it is. I was planning on a Call of Cthulhu campaign and those are the only things I found so they may not have more then that. I hope this helps.


2

The Delta Green book Targets of Opportunity describes the Deep One Colony on Black Cod Island in Alaska. In addition to being more current than the rest of DG, it shows what might have happened to Innsmouth had it been left to fester a few more centuries.


2

First of all, I do not consider this an issue, upon which an official stance (other than: do as you wish) would be taken and has to be taken. This is because in contrast to many other roleplaying games, not all CoC scenarios happen in the very same universe. There are two reasons for this: First, some entities being present in the same universe are certainly ...


2

If you don't mind the bookkeeping, get an idea of the cost per level of the CoC spells by looking at the conversions at the back of the book, and choose the ability to drain in D&D that most closely interacts with the spell in question. Or just roll a d6 and drain a random ability.



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