Quick Item: Kusabimaru
Item Description: A katana given by Kuro, the Divine Heir. An heirloom of the Hirata family, a cadet branch descended from Ashina. Once thought lost, it has found its way back into the hands of Wolf. The name Kusabimaru beseeches, “A shinobi’s role is to kill, but even a shinobi must not forget mercy.” A mantra the blade itself may manifest.
Location: You will obtain this after a cutscene when you make your way into the Moon-view Tower.
Usage: This is your main weapon in the game.
For all Sekiro: Shadows Die Twice items check out the Sekiro Shadows Die Twice Wiki and Strategy Guide