Blame @rarmaster for this, but here. Have some YWKON AU Judas + Chaltier.
Xenoblade Chronicles 2 x Tales of Destiny because Swordians are basically already Blades in the ways that matter. Note: Swordians are backwards. They are a living sword with a core crystal. Chal's "body" is auxiliary at best.
Note: Judas is an involuntary blade eater. Chaltier gave him half of his core crystal to save his life. Generally, Chaltier does not have a tangible body. The body (in this setting) is a hologram-like projection. Thankfully, Jade fixes that later.
Chaltier is an artificial Earth (compassion) Blade! However, due to the way he is designed to hella sync with his driver when he DOES sync, something about his relationship with Leon has actually caused him to also gain the dark aspect (justice).
Judas is armed to the teeth because he refrains from using Chaltier for violence, since Chaltier, being an inanimate object, can’t physically stop people from just picking him up and using him. That’s no good! Chal is fine with Judas wielding him! But he appreciates not being used as a tool for murder.
Yes, I did flip part of the guard around on Chaltier’s hilt to make it FUNCTIONAL. I will leave canon Chal be, but AU = my city now and we like our swords to be functional when possible. The normal (canon) design requires either A) striking with the back of the blade if you want to have a functional guard that keeps your fingers from being sliced off, or B) holding him awkwardly so the guard presses against your wrist and hampers your movement. I don’t think Inomata understood the vital functions of these parts of a saber hilt when designing the Swordians, back in the day.