There are a few bugs in this game like the dreaded cyclone mythic which non of us understand I only tried it once. You spin around like a fool unable to cast spells then something kills you.
even if you add 15% instead of multiplying, the numbers are still off. this would be a nice thing to get debugged, or replace Blessed & Protection with 2 totally new Natures.
+5% Weapon DMG for one, call it Attack or Offense. +2.5% Block for the other, call it Shield or Parry.
there are still 5 other Natures to use (I don’t use Evasion because it only gives +1.5% Dodge, I consider the other 5 to be more useful).