What's it called now?: "Prismatic blade"
What's it look like?: It consists of a black blade (it could resemble a khanda), but it's covered in glowing runes and symbols in a similar style to the "Seal" on the Avenger/Faust (and formerly the Sealed Sword). the runes glow in a way similar to the "Edge" weapons, and have the same color as the player's Personal color.
How's it work?: I think it should have a 4-hit combo (if only because there are no weapons with a combo like that), sound like an electric razor in a metal bowl, do pure elemental damage, and the charge should either be a Fang of Vog styled Spin or it should shoot a Pulsar-esque expanding projectile... or maybe it can shoot an attack similar to a Zombie's breath attack, you comment which one you'd like better.
Why?: Because there are no purely elemental melee weapons (apart from the Flourish line there are NO other weapons that do purely any non-normal damage), and if you want the aesthetics of the Shocking Edge and Searing Edge weapons, well too bad, they're useless outside of Tier 1 and really early parts of Tier 2, and their replacements, the elemental Brandishes, look kinda weird at 4* and 5* with the bifurcation and the lazer in the middle. That and you now have to upgrade the Sealed Sword if you want a sword with glowy bits that actually look decent. Also NONE of the weaponry in the game ever uses your personal color.
Yeah, that's what I got. Tell me what you think
the reason there's no pure elemental/shadow weapons is because the current split swords will look weak.
Also keep in mind flourish has an enormous beast/fiend killing power