Damage formula after RES & MRES applied

[Seiran]

Hello. I would like to ask a question about the Trait Status System - RES and MRES

I'm confusing about the description of RES and MRES. (Reduces physical/magic damage taken BEFORE physical/magic defense is applied.)

What does "Before" means? Do anybody know the actual formula? Are RES or MRES is just a multiplier that calculated as DEF and MDEF? 

[alpha]

up this question.. it kinda hard to make the calculation with the newest patch... 
but from what i test on JRO .. RES and MRES is different from DEF and MDEF 
its like MRES,RES damage calculated first before DEF and MDEF

 

[Sigma]

Yes. res and mres are just "another layer" of damage reduction, calculated before Def or Mdef