More uses for BLoD and NSoD.
I think it would be cool if there were more ways to use BLoD and NSoD to create new items with the same functionality (same bonus damage against undead and all monsters respectively), a bit like Void Light of Destiny or ALod, but specifically changing the appearance rather than adding a bonus stat increase. It would be especially fitting if the item was Legion based as the Void/Nation already has the Void Light of Destiny. I am specifically thinking of NSoD as it would be more fitting because of the alliance between the Shadowscythe and the Legion, though BLoD could work just as well.
My first thoughts about appearance are very minimalistic in change, though make for really cool looking weapons. Sadly I don't have any pictures, unless you could somehow access my brain.
Legion Sword of Doom:
The colour of the bone handle could either stay the same or change to black, either works. The blade would become black with blue energy swirling around it and a glowing blue skull at the guard, a bit like the Legion DoomBlade. Not much else to say to be honest...
Underworld Light of Destiny:
Basically the same changes as Void Light of Destiny with a different colour palette and skull in the centre. The green and red would be glowing blue or white and the skull would be Legion DoomBlade esque rather than a fiend skull.