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Mages are well known for making magical artefacts. It can be a store of additional power, a foci for their own spells, a weapon or even just for show. Some mages prefer staves and staffs, some prefer a wand, heck some prefer just a book. But if JOS ever was it would be to create a spellsword of the same odd crystalline rock he is made of.
But that implies JOS would ever need to…