Changing weapons or weapons that consume other weapons

[Mighty Physche]

I want an ability added to a different weapon, but the weapon is unique already and doesn't have a noted price. Basically I want to add the con dmg bonus from the hammer of earth to an elven courtblade. How would I go about doing this without just saying "I'm the dm, I get what I want!"

[Vizzerdrix]

Reverse engineer the item untill all that remains is the ability. That should give you a ball park price.

[Mighty Physche]

Good to go on price, but are there any weapons that can "eat" abilities of other weapons?

[MisterKaws]

The feat Ancestral Relic, from The Book of Exalted Deeds, lets you shove nearly half your WBL in any form(including magic items) into a single item, so you could just copy an ability over to the new item. However, you can't use it for artifacts, so it won't help in your case.

[barakaka]

He killed the previous owner, and melted the hammer down to form a weapon he could really slay with.

[Vogie]

In PF there's a Allying enchantment (+1 bonus) that allows you to "transfer some or all of the weapon's enhancement bonus to one weapon being used by an ally of the wielder". I could see an equal or higher priced that allows you to do something similar to transfer the damage bonus to another weapon you are wielding.

Maybe with a higher CL than allying (which is 5) because this could easily get abused.

[Mighty Physche]

Thanks to all it was appreciated.