The Sword That Shouldn't Exist -

: Compared to typical iron or pattern-welded blades of the Viking Age, Ulfberht swords were incredibly strong, flexible, and sharp, allowing them to slice through mail armor without shattering.

: They were crafted using crucible steel , a high-purity metal with a carbon content so high that the technology to create it wasn't thought to exist in Europe until the Industrial Revolution. The Sword That Shouldn't Exist

: It has been used to describe Sephiroth's Masamune in various media, highlighting its supernatural length and power. : Compared to typical iron or pattern-welded blades

The phrase "The Sword That Shouldn't Exist" often refers to the legendary , a group of roughly 170 medieval Viking swords found in Europe. These weapons are considered historical anomalies because: The phrase "The Sword That Shouldn't Exist" often

The phrase is also popular in modern gaming and fiction to describe "illegal" or overpowered weapons:

: On collector forums like the Nihonto Message Board , it is often used for modern Chinese fakes that mimic Japanese signatures but lack the correct historical construction.