The DEF Paladin

Defense should be scaled to increase exponentially, so every point of defense from 1-100 is worth 1 def, 101-200 is worth 2 def, 201-300 worth 4 def, etc. A person with 600 def would actually have defense equal to what 6300 def is now.

This way not only is defense scaled so it keeps up with the increase in damage that monsters deal, defense scrolls keep their usefulness through all levels (because +5 def w/ 500 def is worth more than 5 def w/ 100 def)