Lets butcher Norse mythology!

But nah, this was for a particular tabletop game in which we played as somewhat high-powered characters. I figured "why not, I'll make a new take on Fenrir."

So here we go.
This version has Fenris somehow figuring out his fate as the Devourer of the World and decides he doesn't want any part of it. He escapes with the help of his sister, and he takes with him the Gleipnir Binds, which limits his size to that of a child, and the Certain Sword, which acts as a safeguard to sedate him should the binds fail, in addition to acting as his weapon.

As for the fact that a Norse sword is represented as a Japanese sword... Well, lets just say the game had a very anime vibe and there's nothing I love more that clashing culture designs.