Found Guts's sword in Dark Souls 3 along with messages left by

Darkmoon Blade Dark Souls 3 Wiki

Dark Sword Dark Souls 3 STL Digital Model 3D Print Cosplay

I don't know if you guys know this but you can do this visual trick using the Untrue Dark Ring, works for Frozen Blade, Magic Blade and Dark Blade that I know

I did it… I finally got the Darkmoon Blade. My build is complete. : r/darksouls3

Dark Souls 3 Dark Sword Guide: The Best Weapon? – The Fuzzy Pen

Blades of the Darkmoon

Dark Souls 3: The 14 Best Straight Swords, Ranked

How do you get the black blade in Dark Souls 3?

Dark Souls - Design Works, Artbook

Dark Souls 3 Mod The Blades of Ashina Adds Several Sekiro Weapons