Originally Posted by The Damn Guide that no one understands apparently
You need about 830 resilience to reach 10% mitigation, and if you increase your resilience by 830, incoming damage will be reduced by 10% no matter what your resilience was before the increase. If you stack 1660 resilience your mitigation won't be 20% but 19%. Why? I've explained that the relative effect of resilience doesn't change as you stack it, so if 830 resilience decreases damage taken by 10%, if must be so at 0, 830, or any other amount. If you're already at 830 and add 830 more, you're not decreasing by a total of 20% but by 10% twice, so 90% of 90% damage taken is 81%, or 19% mitigation.
3.1. Is survivability from resilience affected by diminishing returns?
No.
This is a common misconception. First I'll explain what diminishing returns (DR for short) are. DR is sometimes used when talking about crowd control, but this is not the case. With diminishing returns people mean that as you stack more of a certain stat (be it resilience, dodge, parry..) the smaller the % increase per rating is.
Some people will say "but the mitigation you get from resilience is lower the higher your resilience is! That's DR!". Yes.. but no. It is true that a certain amount of resilience increases your mitigation value by less the greater your resilience is, so you could say the resilience formula shows DR, but that doesn't mean your mitigation increase is proportionally worse!
Example: What's the effect of 25% extra mitigation when you already have 0% or 25% mitigation? If you have 0 resilience your mitigation is obviously 0%. If you add 25%, for each 100 damage you're dealt before mitigation is applied, you take 75. You've logically reduced your damage by 25%. What happens if you go from 25% to 50%? Instead of taking 75 you take 50 damage, so by increasing your mitigation by 25% you've actually reduced incoming damage by 33%.