I can’t find any reliable info on this other than random forums (they talk about immunities and going under 100 monster resistance but not below 0). Is there a YouTube video specifically about monster resistances going below zero? And is there a cap to it?
planning my gear for the 2.5 patch especially with the cold or fire sorc so this would help a lot
Minus resistance is capped at -100%. Then of course it depends how much resistance a monster has to start with.
Breaking immunities with sunder charm works differently than without it. See these links for more information:
https://diablo-archive.fandom.com/wiki/Resistances_(Diablo_II)
https://diablo-archive.fandom.com/wiki/Immune_Monsters_(Diablo_II)