The Spanish version would go on to dominate battlefields all over the world for hundreds of years, in then hands of the fear-inspiring Tercios. In Lupin III , Goemon has Zantetsuken , a katana made out of either a special alloy or a meteorite depending on the version , which can cut absolutely anything. It also shoots laser beams. Daken had part of it melted down and grafted onto his wrist claws which retract, like Wolverine's. Not to mention that in a series with phasers, using them in actual fighting is unlikely to ever end well.
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OK with cancelled shoots and appearances? Several examples appear in R. Thus, this trope should be reserved for cool swords; those with some exceptional quality, name, or power.