Seven-Branched Sword - Wikipedia
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Divine Dragon Sekiro Shadows Die Twice Wiki
ArtStation - 8 branched sword
Scimitar of the Seven - Zelda Dungeon Wiki, a The Legend of Zelda wiki
Japanese sword - Wikipedia
Amatsu, Fire Emblem Wiki
Nagao Kagetora, TYPE-MOON Wiki
Fire and Steel - Seven Branched Sword
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
Seven Branch Sword Trainer
Baekje: Baekje people, Tang Dynasty generals related to Baekje, Liu Rengui, Seven-Branched Sword, Wani, Su Dingfang, Gyeon Hwon