The weapon that was given to Alex (Shang) as the second gift by the God ( name is unknown at this time). As an apex companion weapon, it's is made with the level 5 concept of metal magic.

The sword grows along with Shang as it evolves when it is provided higher quality ore, gaining higher strength and intelligence. This function is provided due to the lack of high level blacksmiths to forge weapons. In reality Sword is Shang, they are one in the same.
The sword was named Sword as Sword wanted to be known as the best of his kind and when someone thinks of the best sword they will think of Sword.
Sword was taught by Gleipnir which helped it gain intelligence and speed up its learning.
In Chapter 740 of the Novel, the concepts used to create 'sword' were revealed which are:
"A complex and fluid Magic Circle," Shang said. "The level two Concept of Life, Change, the level three Concept of Gravity, Compression, the level two Concept of Space, Distance, the level three Concept of Metal, Steel, and the most impressive of all, the level five Concept of Metal, Destruction."
Were used to create sword ;)
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