Def/mdef>>>resis

How many def or mdef transfer to physical resis or magic resis??

 

I did save a lot of mayam's explanation. Let me quote it.
"Question About Hows def and mdef works

No it does not reduce evasion and no defense does not reduce damage by a flat value.

0 - 250 Def/Mdef = 0.8% damage reduction per 10 Def/Mdef(20% at 250)

250 - 1250 Def/Mdef = 1% damage reduction per 100 Def/Mdef(10% more if 1250 Def totalling to 30% reduction)

1250 - N Def/Mdef = 3% damage reduction per 1000 Def/Mdef

Let's say you have 6250 Def(probably only possible on mercenary):

250 / 10 * 0.8 = 20%

1250 - 250 = 1000 / 100 * 1 = 10%

6250 - 1250 = 5000 / 1000 * 3 = 15%

With 6250 Def, you'll have 45% physical damage reduction.

You see the diminishing returns? That's why having 250 Def is enough. "
and another one
" NEW SECRET INFO**:-
From secret sources the actual limits were found out to be:-
0 to 250:- 10def/mdef = 0.8% reduction
250 to 1250:- 100def/mdef = 1% reduction
1250+:- 1000def/mdef = 3% reduction

According to these limits actual optimum value seems to be 250
You will need 24584def/mdef to reduce non fractional attacks to 1dmg "

 

Def and mdef doesn't transfer to physical and magical res. The reductions multiplies each other.
Example: you have 250 def and 10% physical res, you take (100%-(0.8×25)%)×(100%-10%)=72% original physical damage