The sword, one of the most lethal weapons in CQC history. It has many spawns and incarnations of it, so its hard to wonder which one you should use for combat. With that Said, here are the top 10 Swords in all of history. For this list, i picked out some of the most popular of swords, so don't expect to see any swords i haven't heard of yet.
Tessagia isn't your everyday Katana, it can transform into many powerful forms with the power held inside. Wielded by Inyuasha, A half dog-demon who slices other demons to pieces using this sword. The sword eventually unlocks its true power and helps Inyuasha destroy his final target.
Hattori Hanzo, a legendary Japanese sword, is the slayer of Bill, the nemesis of Beatrix Kiddo, AKA The Bride. Beatrix was given this sword, forged by one with the same name. Beatrix learns every skill she knows to defeat all of the people who had taken Her Wedding, Her Unborn Child, and 4 years of her life.
The falchion, only a few have held this sword. The first was Marth, Prince/King of Altea. He used his version to destroy the evil shadow dragon. Years later, Chrom, Prince/Exalt of Ylisse, wielded this weapon. with help from the fire emblem, he upgraded his sword to its Exalted Form, and used to defeat the return of Grima.
Narsil, the sword of Aragorn, is the slayer of the mouth of Sauron and killer of most of his army. Narsil was once used to kill Sauron himself, and later by Aragorn to finish the job on his army. Narsil hasn't appeared since the movie in 2003, but is still considered a good sword.
Ok, we we're all expecting this one. The buster sword is the sword of Cloud Strife, and slayer of his rival, Sephiroth. The buster sword is very heavy, only 3 people have wielded it, and used it to defeat evil one by one.