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Musashi watched, transfixed, as Marzan began the act of forging a blade from Musashi. She was no smith, and certainly no master craftsman at that. But as a skilled swordswoman, she recognized a master at work when she saw it. The strange, mystic fires danced around Marzan as he worked, and every blow was perfectly placed and precisely measured. Musashi watched as he began working the mass of melted ore into metal, and from that metal, drove out every impurity.
Musashi would not comprehend the significance of folding a blade so many times, but ultimately she would not need to: she knew the basic principles of folding steel was to drive out impurities, and at this point, Musashi doubted that any remained within the ore. With so many folds, one could argue that there were no longer any layers in the sword, and perhaps it was a solid, perfect crystal of steel.
The process was mesmerizing, and Musashi watched, transfixed, despite the incredible length of the process. Such stuff demonstrations often left her antsy and restless, and this did to, but in a different sense. When Musashi saw a skilled swordsman, she wanted to fight them. When watching Marzan forge, she wanted to observe it, to burn the the image into her mind so that it was preserved for eternity.
Musashi took the blade, and held it in her hand, observing it. It's balance was immaculate, and its edge sharp beyond reason. He was right in calling it a blade that could slay both Demon and God - the sword would indiscriminately and unfailingly cut whatever it was brought against. It would be a blade that would take Musashi to great heights, as Marzan had promised. Musashi did not know if this was a sword that could cut the Void - but it would certainly be one that could cut through everything up to it. The search for a "sword that could cut the Void" wasn't even literal - it wasn't a magic sword Musashi sought, but the skill to make any sword she wielded do so.
But this, could almost do it alone. Such a tremendous stride taken in an instant, and Musashi would have all the time in the world to practice with the blade and learn to cut like so, herself.
And those flames...
"Great-Gramps, this is...magnificent," she said, in an almost hushed tone. "Myōjingiri is a fine name. Emiya wasn't kidding when he said you could not find a better sword - thank you!" she said, hugging the old man.
She sheathed the blade, it making a satisfying noise as she did so. Many people would swing their new sword about to test it, but that was usually for show and accomplished nothing. Musashi recognized quality in a blade when she held it.
"I'm surprised more people aren't coming to you for blade!" she exclaimed, exasperated, and suddenly realizing how hungry she was form all the hiking she had done - and remaining transfixed for so long.