Nioh and Nioh 2 (including all DLCs) are also bundled in the Nioh Collection on PS5.
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Ishida Mitsunari Boss Guide
Ishida Mitsunari is a boss that William will encounter in Main Mission: A Defiled Holy Mountain. He uses a katana imbued with the element of wind. Although the regular katana can only do short range attacks, his katana can launch wind-elemental projectiles.
Use a spear in mid stance during this fight so that you can damage him from a distance without getting into the hitbox of his katana. Ishida Mitsunari will fire 1 to 4 projectiles at you if you are far away. Dodge these attacks then approach him. Use strong spear attacks against him after you dodge his close range attacks. By doing this, you will be able to deplete his Ki quickly. Once his Ki is depleted, attack him with a finisher or a barrage of strong attacks.