If your thinking of animated swords, there arent many. Your typical Fiery/Icy Dragon sword or a Fiery Embersteel Blade which may look quite nice with it.
Matching with the shield doesnt only matter on your shield, in this case, a tormented shield, but the type or bulk of your armor and the size of the gloves your wearing, IE: bulky armor or big gloves makes swords look tiny.
no matter what, tormy sword is always gonna look the best with the shield........failing that ,destroyer, simply because it looks badass, not because it goes well with it
Because the runic blade doesn't exactly match. It's a "proper" sword that would match with a "proper" shield like the Draconic, or a Tall Shield. Not something other-worldly and magical like the Torm shield.