Yo.
Crushing blow will take 1/10 of enemy remaining life in pvp, but is affected by DR%.
That means its also affected by forexample amplify damage.
The formula for its damage is:
Melee: EnemyCurrentHP/10*(1-(DR%/100))
Ranged: EnemyCurrentHP/20*(1-(DR%/100))
So if enemy has 2500 HP left, here is 2 example, one with +50% DR, and one with -50% DR after amped:
2500/10*(1-(50/100)) = 125 life lost
2500/10*(1-(-50/100)) = 375 life lost
CB will roll first, before any other form of damage. If it rolls a hit it strikes first.
Very good on fast attacks which carries rather low damage such as assassin wirl, assassin kicks(espesially in combination with amp).
Meanwhile it will ofc help on smiters and such as well.
For ranged its 1/20 of enemy life, so half as good.
Simce when amp give tripple damaches?