Continuation of #8539, taking https://gitlab.com/OpenMW/openmw/-/issues/2321#note_2536610826 into consideration. `MWMechanics::getEffectResistance` appears to match the research https://wiki.openmw.org/index.php?title=Research:Magic#Magic_resistance but yields non-vanilla effects. If `x <= 0` so `x` is set to `0`, the final value of `x` can still be non-zero due to `resistance` being factored in. This means that resistance is applied twice, but the second application is unlikely to be meaningful. It also means that a character with 10% magicka resistance will be silenced for 0.9 points, making `GetSilence` return 0. This is not the case in Morrowind.exe where the saved stat is an int and `GetSilence` will return 1 even if the player has 50% magicka resistance. The research notes that the resistance value is stored separately in what we'd probably call `ESM::ActiveEffect`. It seems likely to me that that value is discarded or disregarded for `NoMagnitude` effects. We should probably change the code to ```c++ float roll = Misc::Rng::rollClosedProbability(prng) * 100; if (magicEffect->mData.mFlags & ESM::MagicEffect::NoMagnitude) { roll -= resistance; if (x <= roll) return 0; return 100; } if (x <= roll) x = 0; else x = roll / std::min(x, 100.f); x = std::min(x + resistance, 100.f); return x; ```