Very late for Artfight, but here's updated art of Gwuenevere with her magic Thread and her Woven Blade.
Gwuenevere prepares an attack with a flourish of magical splendor. Sprouting from her fingers are thin thread, flowing together into long cords of crystalized ichor which is then molded into a blade. Woven by thousands of magical Threads, the blade takes on a piercing shape. Like that of a sewing needle, it displays an eye by which Gwuenevere's Thread flows through.
It seems to be made with precise attention, but it is short and deceptively brittle. While Gwuenevere 's Woven Blade does not cut well, it is made to puncture. To quickly dart and dig into the enemy's core and out again. The blade carries her Thread into their wounds, which its strands then burst into a painful cluster of metal crystals. With their interiors made from Gwuenevere's ichor, these crystals bleed themselves deeper and grow more of themselves from within.
A devastating sight to witness. Yet many witless War-Fitted would find themselves bearing ichor scars from their battles with Gwuenevere. Some, if very unfortunate, would face their demise by her blade. Those crystals creep deep, damaging the integrity of one's ichor structure, leaving a wake of destruction that corrodes throughout.
A ruination that finds no cure by any measure.