I dunno if it's darker per se; it's supposed to be a toolkit, along the lines of AFMBE.

Now, the settings included in said toolkit might be darker in tone (though from what little I do know, I don't believe they all are), but overall, BH isn't darker than Buffy at all (imho)
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I just wish Hollywood would really stop looting other stuff. They are the Roman Empire of Film!!- Canadian Pitbull, on Hollywood's obsession with remakes