Only Poker face or someone that remember the post from Nexon forum can answer. If I remember well new ranks [black knight twilight knight knight of down] gives 2% PK/PVP DMG Tolerance per rank. not sure for the rest...
In our version of Dekaron, ranks don't give pk/pvp resistance. They give skill points, stat points, shield, defense, max HP, max melee, max magic & max range (max values stack but don't multiply).
P.S. Found the table I made long time ago, but is still actual:
Comments
Main Char:
MadeInChine <<<
Segita Hunter 192
Alt Char:
Galaxy <<<
Aloken 170