What kind of Paladin am I?

[ShadowHM]

No, I think he's right. I just checked this up in the manual. Quote on Quote:

Cold Mastery (passive)

Once mastery over this powerful elemental force is attained, a Sorceress achieves perfect command over this school of magic. Her freezing spells are now of such potency that adversaries formerly impervious to thier effects soon find themselves the surprised victims of a viscious, chilly assault.
note (this seems to only apply to cold)
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Perhaps you should have read the entire section:

Cold Mastery will not work against monsters that are Immune to Cold. So even if you have Enemy Resistance -105%, they will still be Cold Immune and you will still be unable to damage them. So what's the point of 100%+ you might ask? Well if they are NOT Cold Immune, it will lower their Cold Resistance down below 0% which essentially means they will take more damage. It's just like when *you* have negative resistances in Nightmare/Hell difficulty.

Having said that, the manuals provided by Blizzard are notorious for errors. However, adeyke is not. :) When he posts a response to a technical question, you can take it as gospel.