Is this effect multiplicative (like if an enemy has 50% resistance and you have a -50% passive, it becomes 25% resistance) or additive (50% resist + -50% passive which makes the resistance 0%)?
External link →Is this effect multiplicative (like if an enemy has 50% resistance and you have a -50% passive, it becomes 25% resistance) or additive (50% resist + -50% passive which makes the resistance 0%)?
External link →+/-% directly is always additive to other sources.
It's directly subtracted from their "increased phys reduction" (which is fantastic terminology...).
it's subtracted from "Physical Damage Reduction".
"increased phys reduction" (or any equivalent) doesn't appear anywhere in the game - there are no "increased" modifiers that apply to Physical Damage Reduction at all, only + and - modifiers.
Do you happen to know if it goes below zero?
Physical Damage Reduction cannot be below zero.