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Which is simply referred to as "The Sword of the King".
It is a massive Zweihander, created in a Crystal Forge, imbued with the strength of the Genbu Crystal and is said to cleave the most powerful of beings in two with a single strike if swung hard enough.
I have always hoped for a BERSERK Final Fantasy Game to be made realized. Official GILGAMESH of every Gamefaqs Board