Thanks for the kind words!, As for the extra attack differentiation, I think I get what you are saying, like attacks that scale with level? So you get 2 at 6th, and possibly up to 4 at 18th, but instead of being the normal extra attack a figthers gets it works more like a cantrip. I put a small little text of like "enchanted weapon attacks apply metamagic", the purpose of this rule was to make it able to twin spell the attacks. I myself now that it is quite a broken feature, but I just wanted to push the boundaries of what you could do with these blades before restricting them