Cosmetic items and enchant colors effects looks good but add rare craft like on h5, loot boxes or change items DHA and HD bad idea.
Start with the fact that DHA and HD are absolutely different weapons and they are both relevant for different tasks. They cannot be compared, they are different.
HD are type "Two Hand Sword"
DHA have type "Two Hand Blunt"
Changing these items will changes all logic of the game for whole titan class because his skills work differently depending on the type of weapon.
p.s.
There are only a few weapons on the server enchanted to +16 and they cost 2000+ (am\db 3500-4000+) CoLs, no one will enchant them to +17 or +18 with a 5% chance, this dont have sense..