so i just checked my stats with and without my R8R pants with 10% elemental resistance.
in full DPH gear i have 77.79% reduce magic def
with the 10% increase i have 78.49% reduce magic def
even when i go full retard with mag ring and def cape i still have no more then 1% mag red when using the 10% buff
so my question, why do people even bother using this over the 2% magic reduction you can have in gear?
I haven't tested it but you need to note that..
+10% mdef gives in fact 3.3% mdef resistance in your case, because in total it's:
22.21% (100%- 77.79%) damage taken without reduction and 21.51% (100%- 78.49%) damage with reduction
now if you compare it, it will be:
21.51%/22.21% = 0.968 , so you will be receiving 3.3% damage less
3.3% real reduction > 2% real reduction
but then again, these are my common sense guesses, that would need proper testing