1.10 sorc

[Guest]

In 1.10, if you are dealing with immunities, all resistance-lowering skills have penalty of 0.2.
In case of your example
1. Apply Lower Resist and -target cold resist.
180-(50+10)*0.2=168
2. Apply cold mastery.
168*(1-0.5*0.2)=166.32
Monster is still immune.

that should only apply to 2 skills.

patch changes

Lower Resist and Conviction skills now work against immune monsters (those with 100+ resistance) at 20% effectiveness.

Cold Mastery and items with the magic property "Lowers Enemy Resistance" now applies to immune monsters.
Cold Mastery and elemental piercing have been changed to a constant amount.

ok, so what it says about cold and lowers resistance mods is that it should plainly removes the number of what it says it pierces. 150% cold resist vs 50% piercing = 100% cold resist.

does it do that though? no, nothing at all! dark hunters have exactly 100 cold resist in hell, and can be found from the cold plains wp, so it's very easy to test.

go there with any cold piercing amount you want(cold mastery and piercing mod are the same thing btw, so both are broken) and any 1000's of damage cold spell, and you'll see you do zero damage.