Enemy Critical Strike Multiplier Reduction

It's a percentage reduction applied to the part of the enemy's critical strike multiplier that is above 100%.

So if the enemy has a critical strike multiplier of 150%, and you have 10% reduciton from this stat, it takes the 'extra' value of 50%, and reduces it by 10%, to 45%, giving an effective crit damage multiplier of 145%.

The amount of damage above a regular hit that the crit would cause, is reduced by 10%.

Because stacking enough of that stat would cause a crit to do less damage than a regular hit, which we specifically wanted to avoid. Hence why it only reduces the 'extra' damage, so the crit can never be reduced to be less effective than a regular hit.

Players have a base critical strike multiplier of 150
Monsters have a base critical strike multiplier of 130, by default. It's theoretically possible that certain types of monsters override this base value, but I doubt any do.

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Umbraal wrote:

He is not correct. When you have your crit reflected, you will take a crit from the monster. Thus it will be reduced.

This is not true. reflected damage is only about the amount, no reflection is capable of being a crit.

Also, turns out these passives were reducing all extra damage from enemy crits, even if you just have one passive, due to a rounding error (the multiplier was treated as an integer, so any multiplier below 100% rounded to 0). Expect that to be fixed in 0.10.7.