Nioh and Nioh 2 (including all DLCs) are also bundled in the Nioh Collection on PS5.
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Obsidian Samurai Boss Guide
Obsidian Samurai is the boss that William will encounter in Main Mission: The Samurai from Sawayama.
The Obsidian Samurai is a heavy hitter due to his axe, but he moves slow while he is equipped with this heavy weapon. The best way to land attacks on this boss is to use a spear in mid stance, as getting too close to him using a katana can be very dangerous. Land 1 to 3 hits on him then dodge his attacks. Repeat the process until he brings out his katana.
Using the katana, he now moves faster then before, so use your reflexes to dodge his attacks. He will eventually bring back out the axe, so this is the perfect time for you to land multiple hits.