Only stuff like Lower Resist curse and Conviction aura works in breaking monster elemental immunity and @ over 100% resist to an element they work at 1/5 effectiveness. After immunity is broken the effects of facets/gear start kicking in. For example a merc with Inifnity offers slvl 12 conviction aura which lowers fire/lightning/cold resistance by -85. For a lightning immune 100+ lightning resist conviction works at 85/5 = -17% lightning resist hence monsters with 116% lightning resist and over are unbreakable. However if you do an alternative form of damage (physical/other element) this is a moot point. Cheers
