Incidentally, it also got me thinking about an "Invisible" sword concept, where you basically have a regular weapon but it's invisible. Only you can see it but others can't, which can be like, you have advantage on attacks against them because they can't see your weapon and know how to gauge distance or if it's an axe or a sword. Or if you're just holding a spear in a very awkward fashion. But this works better on a cinematic level than one like RPing.