I'm curious about this edge. Edge helpfile states that it grants inately resistant to disease. I take this to mean like racial resistance. If one is vulnerable to disease, and takes this, does this edge give one resistance to diseases, instead of vulnerable to disease, or would it make diseases "normal". Or is the resistance not true resistance and only a % of reduction of damage from diseases?

If I recall correctly, it grants 'resistance' to disease, as per the racial advantages of other classes. You will be harder to disease, and diseases will sap your hp/mana/mvs less as a result.

I am not certain how this edge interacts with any other forms of innate disease resistance.