Nioh and Nioh 2 (including all DLCs) are also bundled in the Nioh Collection on PS5.
“Honoji–a temple in the northern area of Yamashiro-no-kuni and the final resting place of Oda Nobunaga, killed just before he was able to realize his ambition of uniting all of Japan. Known as both demon and hero for gaining control of nearly all of Japan with unprecedented speed, Oda Nobunaga was killed in 1582 when he was betrayed by one of his allies, and his sudden death sent shockwaves throughout the land. The betrayer–Akechi Mitsuhide– was himself quickly killed, and his intentions in killing Nobunaga remain shrouded in mystery. Even now, nearly 20 years later, no one enters the temple for fear of the curse of Oda Nobunaga.”
The Inheritance is a Sub Mission that occurs in the Yamashiro-no-kuni.
Sub Mission – The Inheritance Walkthrough
Head forward into the building. Fight the monsters that appear. Watch out for the gigantic axe monster as well as an undead rifleman. Take them out.
Head forward into the large hall. Fight the undead monsters inside. Afterwards, get ready for a fight with a raven monster. Destroy him. Once you’re done, loot the hallway and head towards the exit. The dark cloud will eventually fade, allowing you to leave. In the wintry courtyard, you’ll find a samurai to neutralize. Destroy him.
Once you’re done, a cutscene will trigger.