Potency increases the base chance to apply an effect (it’s checked during combat). So, if your Resist is higher than the final chance of the debuff, it will never be applied.
However, you don’t know the base chance of enemies’ effects and skills (and most of the time they’re lower than 100%), and right now you can’t even check stats during combat.
Also, DoT damage checks against both pDEF and mDEF, and since it deals small amounts of damage but ticks very often, increasing pDEF and mDEF can potentially help (but probably not on higher waves).
I’m planning to add a proper info panel during the combat phase so players will have a better understanding of what’s going on. :)
