I highly doubt Larian wrote their own RNG. They probably use default provided by standard C libraries or some other off-the-shelf solution. We are not talking about secure crypto solution here, just giving random enough 1-20 numbers, anything decently competent is enough. When asked for actual data and statistical analysis, all we get is more "but I can see pattern!" anecdotes. Please provide real numbers, not feelings, otherwise I call bullshit on your claims.
I dunno, if I wrote the RNG I'd use tables with certain interesting biases, the choice of which could be selected depending on the particular user or profile, just to wind people up. Fortunately I am not one of their game devs.
