Cast bronze weapons generally required polishing, filing, and sharpening because no matter how perfect the mould was, in practice casting the metal alloy in the mould always had some imperfections. He had a vague feeling that this would be the sword he would be using in the future, so he didn't imbue any magic during the casting process, and he waited for the blade to cool down enough before taking his time to carefully file, polish the blade, and sharpen the edge to the utmost possible limit. He had winter heat up the alloy again, and he finally used the ritualistic sacrifice to bind the enchantments to the blade.