I was hoping to get my rank up to Sergeant in order to give UV a spin, but the highest my character level has ever gone was level 11 on a successful Hurt Me Plenty run, killing almost all enemies except for going to & skipping the Unholy Cathedral by accident. So what I'm saying is that there doesn't seem to be enough stuff to kill to reach level 15. I understand that easy mode gives a +40% experience bonus, but that doesn't seem like enough to overcome the weak volume of monsters. How do you break lvl 15 without playing on UV?