Witchcraft d20

[Matt Larkin (author)]

I like your choice on the druid/sorcerer.

Maybe you could combine the idea of the warlock (Complete Arcane) and sorcerer for your inborn talent idea?  Making it vaguely demonic seems to fit well with the dark theme.

[Hibou]

Indeed, that is a possibility. The replacement(for the sorcerer)'s image that I had in mind would probably be lacking much of a direct damage power, but something such as that might work. I'm thinking of a kind of one-power-per-sorcerer sort of thing, such as an unusual ability that works like a charm spell, the ability to levitate, invisibility, extremely improved sight and hearing capabilities, etc.

Making some of it have a demonic origin, or adding in features that would suggest such a thing would be cool too.