Weapon/armor enhancement
 

Just a thought that occured to me:

What if you could enhance your weapon/armor by spending your experience or maybe even add certain attributes, such as resistances, extra damage, or more AC/WC.

Ofcourse, it would be a set amount, it should be percentage based on your level, i.e. it would take maybe 700,000 experience to enhance something if you are level 21 or so but maybe 150,000 if you were level 8.