Does It???

i was wondering does cold mastery help frozen orb cause i add it and it seems like it dont...?

Indirectly. It is meant to pierce the enemies cold resistance, like it says on the description.

The amusing thing is, monsters that are Immune to Cold are also immune to the effects of Cold Mastery.

I hate that, it defeats half of the purpose of lowering resists...

And it already cannot go below zero percent for the non-immunes.

They need a runeword that grants you Conviction when worn.

Cold Mastery would still help you in hell for example if you had it at a lvl over 20 or around there right

They need a runeword that grants you Conviction when worn.

Come on now... That would not be fair at all. If they do that they they would need to make it like -50 to all resists for you too and maybe -200 hp for you.

Tell you what. Make one up yourself and make a new thread. We can vote if it is balanced or overpowered. Could be fun seeing what people come up with.