Seven-Branched Sword - Wikipedia

Japanese sword - Wikipedia

Seven Branched Sword - Alchetron, The Free Social Encyclopedia

List of National Treasures of Japan (crafts: swords) - Wikipedia

Japanese sword - Wikipedia

Alluring Seven-Branched Sword, Gekkakou, Z/X -Zillions of enemy X- Wiki

Fusion Sword, Final Fantasy Wiki

Nanatsusayanotachi, Final Fantasy Wiki

Korean sword - Wikipedia

Shadow Eminence, Blue Heater Wiki

Maybe a hint from possible reference but considering the divine dragon's sword and he comes from the west,sekiro 2 will probably be in korea : r/Sekiro

File:Chiljido Seven-Branched Sword (30110320331).jpg - Wikimedia Commons

Seven-Branched Sword Skin - Guild Wars 2 Wiki (GW2W)