Well there is one thing SE hasn't done yet is make weapons that are
ethereal. Much like the monks have the ability to do formless strikes these weapons would be PURE non-elemental magical energy, not slashing, piecing or blunt etc.
Just making another of the same thing is silly at this point. Something like these would be EXTREMELY unique and useful. Will people listen, no 99% of the gaming population thinks inside the box and refuses to promote new ideas. It's sad when good unique ideas like this get totally ignored because the readers skim right over it without thinking.
So, If you're asking for something the same as the relics mythic and empy types you don't have my vote. If you're asking for something unique that's based on pure energy defies (Normal) I'm all for another set of upgradable weapons.
Click the link these are totally magic
ethereal weapons.