PoE Gullipo builds

Hi folks, so atm I´m PoBi´ing an Occultist and was thinking how good the defense layers in the title would work together. Malediction and Frigid Wake: 20% reduced Damage from hits Petrified Blood: 40% prevented (ofc there is the dot) Mom + Eldritch battery: 30% of dmg is taken from energy shield Fortify: 20% less dmg taken from hits On paper that sounds pretty good, but in reality I have no idea how this works all together. Can anybody help with the math?? Thx for your time mates! this is the POB so far, if u want to have a look