This was a character I had in mind for a looong time. I don't have a clear backstory for the character and I don't want to half ass one here because It might turn out to be Coldsteel The Hedgehog v2.0 that way.
Basically the guy is an unaging warrior, he's been alive for hundreds of years. Uses both technology and sorcery on his gear. The gun on his back is a normal Spas-12 shotgun and the gigantic sword is a Crystal Tree Sword.
The sword is especially effective for enormous beasts because magic. The sword is very hard which makes it very tough but also fragile.