Nioh and Nioh 2 (including all DLCs) are also bundled in the Nioh Collection on PS5.
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Edward Kelley Boss Guide
Edward Kelley is a boss that you will fight during Main Mission: The Demon King Revealed. Kelley is mostly using his snake guardian spirit to execute attacks. He would also spawn his sword, but the damage that it deals is not very high.
Use a spear in mid stance as it can deal damage from a distance. Since he uses a snake guardian spirit as a weapon, he can attack from short range and long range. Keep dodging his attacks then proceed to strike him with the spear. Once he releases his shield, run away from him as he will unleash a powerful attack.
When he runs out of Ki, strike him with a strong attack using the triangle button to deal massive damage against him. The best way to defeat him easily is to deplete his Ki.