[rcarter]

I just had another thought that might be helpful for you, not sure why i didn't mention it earlier. Came up with the idea before i had a copy of cthulhupunk, but i had thaumatology.

As you can tell from my sig I'm pretty heavy into CoC and the mythos using GURPS rules. I implement the mythos in many campaigns, dark fantasy, sci-fi etc, basically everything.

In my dark fantasy campaign Mythos Cultists are the only Characters whose non-mythos magic works based on threshold magic (from thaumatology). So when it comes to basic spells cultists have the largest amount of potential mana to draw on for spellcasting but they are channelling the power of the malign entities that they worship and so the magic can have powerful side effects when they excede their threshold limits that are usually very bad - very very bad....