Cool Sword Day gives us plenty to celebrate each year. Meteorite swords. Video game swords. People commissioning swords from local swordsmiths. There are so many cool swords, you might be tempted to use two of them at the same time.

But to paraphrase Justin Timberlake as Sean Parker in the (sword-less) masterpiece The Social Network: You know what’s cooler than two swords? Three swords.

Roronoa Zoro understands this. The One Piece legend has........

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