I would like to see legendary weapons similar to Lord of the Rings Online. We could craft them, name them, and have them level up as we use them, which in turn would increase certain stats on the weapon as it leveled up.
What would really put this over the top would be if we could add existing legendary cosmetic concepts to the weapons, such as changing appearance or other aesthetic additions as they level up (Giving your armor aura’s, character wings, special footsteps, different animations for existing abilities).
Perhaps there could even be a mini achievement tree that allows your weapon to gain titles based off what it has slain and such.
What if you could always trade these weapons so their legacy can live on with another owner?
I think this addition would just blow the minds of those who like to customize.