You know how the Rune/Ancient/Statue items don't do anything but sell, right? Well.. I think there should be another use. Like making them into items you can combine with weapons, equipping so they can have different effects.
But to avoid the abuse of the function, make it a priced event in the forest as rare as the peddler and merchant. Speaking of the merchant... We can have him be the one willing to combine the items to your equipment. It's not Naruto or Shinobi based, but neither are the rune/ancient items to begin with.
Combinable Items:
All Ancient items.
All Rune items.
Burning Tokens.
The abilities of the combined ancient items~ Variable
This could also satisfy the people that wanted weapons and armour to have special elemental effects.
~Ancient items; randomize the effects. Fire, ice, lightning, earth, wind, water. They'd be randomized.
~Rune items; you could have Xaos, our item master, create more rune things. And make them ice or fire runes and such.
~Burning Tokens; pretty much by the obviousness of it's name, it'd give your weapon fire ability. But again, we could have Xaos make Freezing Tokens, Flashing Tokens (light), etc. etc.
~Statues; So far, I've had Orochimaru, Yondaime, and the Kingly Wolf. Some could be temporary stat boost, mainly in consideration for Gyu and Sin. Orochimaru could temporarily increase your attack by 1. Yondaime could increase your health permanently by 1. And the Kingly Wolf could temporarily increase your defense by 1. I could decide on other statue abilities when I get more statues, if there even is more.
Prices for Attributes; Increases with the level of your weapon/armour. Let's be evil and make it a gem per level. So level 15 would be 15 gems. Gold prices could increase by 150 per level of character or weapon/armour or even both.
All attributes will be temporary for THAT weapon/armour, and they can only be combined twice per DK. So if you buy another one, tough luck.
This way... everybody is happy in a fair kind of sense.