I saw your avatar and I was like “I know that face from somewhere!” but I couldn’t remember the name of the comic. I remember reading it a very long time ago but I didn’t even know if it had finished, so I did a bit of searching and it’s Feng Shen Ji. I think I’m just going to start from the beginning.
The back story, or the scabbard? If it's the latter:
It's exactly as I said it is, just a magical scabbard. The scabbard was made from magical minerals and enchanted. It was just a scabbard, no sword. To get the sword, you must create one yourself and through the scabbard. It's even stronger than something you would normally smith since the scabbard itself is magical and a catalyst.
I don't plan on it (the sword) being an integral part of his fighting style though, he's gonna be ranged more times than not unless he's forced to go CQC.
It's more of a memento of his brother than anything else. The time it also takes to make the sword is also fairly quick since after his brother died he would continually make the sword in his memory.