Attacker takes damage of x?

[Tommi]

Tommi's Site (Damage Modification Mechanisms):

From Section 2.3

Step #2: Apply all reduction effects, except Cold Mastery --> subtract their effects from the result

Step #3: Apply cold mastery --> multiply the result by 1 - Cold Mastery % / 100 and round down (only with cold resistance)

Should I interpret that to mean that Cold Mastery actually reduces cold damage if the target had negative cold resistance after step #2?

Yes, that's my understanding. I asked people how it works in this thread, and copied the result of the discussion to the page. Technically, the resistance is not negative at the step 3, since the difficulty penalty is not taken into account until the step 4.

Cheers,

Tommi