Sure does. And it's awesome. I posted this this moorning in another thread.
2 30 second fights with same level mob. One with DC, one without.
This is not very scientific but it definitely seems additive to me. Total damage from 939 down to 173. My common mit is at 49% unbuffed so 939 would be about 2000 damage unmittigated. At 90% mits (DC additive) we would expect around 200 total damage. At 70% (DC multiplicative) we would expect around 600 damage.
Seems to support that DC is additive.
I am not oblivious to the fact that this is a very small sample size so further confirmation would be great.[/QUOTE]
Curiously, the evolution of the internet seems inversely proportional to the evolution of man.