Dark Souls 3: The 14 Best Straight Swords, Ranked

Dark Blade, Blox Fruits Wiki

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

Dark Sword - Dark Souls 3 Guide - IGN

This might be obvious but doesn't the onyx blade look like the hollows tried to recreate the firelink greatsword? : r/darksouls3

How to find some of Dark Souls 3's best hidden weapons

Dark Souls III Guide/Walkthrough - Weapon Arts

Dark Souls 3: Black Blade PvP - A Tiny Yet Powerful Katana! (Pick My Weapon #101)

Dark Souls 3: The 10 Best Curved Swords, Ranked

Best Faith Builds For PVE And PVP In Dark Souls 3

ArtStation - Onyx Blade