The Favonius Codex is an elegant, book-like weapon with a hardcover binding adorned with intricate gold filigree and the emblem of the Knights of Favonius. The cover is made of a dark blue leather-like material with a smooth, slightly worn texture, suggesting frequent use. The pages inside are edged with gold and appear to glow faintly with a soft blue light, hinting at the magical energy contained within. The book is secured with a golden clasp that features a small, ornate keyhole, adding to its mysterious and arcane appearance.