Does Cold Mastery remove Cold Immunity in Hell mode?

[FrozenFruit-1724]

currently, Yes.
It works similar to Conviction and Lower Resist
Its value is 20% and if it lowers the resistance below 100% then it breaks the immunity.

Can we get an "official" Blue comment on the Cold Mastery change?

Sorceress’ Cold Mastery used to not be able to break Cold Immunes, but in D2R, this has changed, and it can break CI’s similar to Conviction Aura or Lower Resist. Many people speculate that Cold Mastery was finally “fixed” and the current skill behavior is how it was supposed to be all along. TBH it makes sense given the way other skills in this category work. But I’ll be the first to admit this is a massive QoL iomprovement and buff to the already strong Cold Sorceress. Many others speculate …