Frostmourne is a great suggestion, will be next on the list.
Problem is most of the weapons act strangely when swung at high speeds, tearing the pieces apart. This sadly isn't fixable as far as we know.
Another issue with having multiple copies of these weapons is the joint object limit. The more advanced weapons have several more joint objects than regular objects, making it impossible to have two of them in most cases.
*Edit*
Added Frostmourne, thanks to HawkeyeTFA for the awesome suggestion
Last edited by jisse; Oct 23, 2016 at 10:14 PM.