The Box's Guardian Walkthrough - Nioh 3

I met an Onmyo mage who claimed that fearsome warriors stole a box. Onmyo mages are tasked with protecting Kyoto, and I cannot simply brush them off. It seems the warriors are in a large house located to the west. I should go and retrieve the box.

[1] Talk to the man.

Warriors have taken the Onmyo mage's precious box and he begs you to help him get it back.

[2] Search for the ferocious warriors.

Go north to the upper-right part of the area with the stacks of boxes.

Destroy the boxes and use the Spirit Vein to get to the abandoned house on the other side.

Go inside the house and touch the shining sword. Choose Fight Revenant.

[3] Defeat the Demon Slayer.

Here are some tips in battling them!
・Attack right after they do their combo
・Do fast combo attacks to overwhelm them (You can also do this in Samurai Style depending on your weapon and abilities)
・Use Ninjutsu to inflict status conditions on them
・Use Onmyo magic or mid-air attacks to break their guarding stance

[4] Retrieve the box.

Search through the box's contents. Shortly, the mage will make an appearance.

[5] Defeat Ninja Yoki.

The mage wants to get rid of you! Here are some tips in fighting them!
・Get rid of the large one-eyed Oni first
・You need to be a bit of a distance away in order to trigger Ninja Yoki's Burst Break
・After that Burst Break (which they try to proc often), it should be easy to get their Ki to 0 and Grapple them!

・Ninja's Locks
・Smithing Text: Demon Cutter
・Smithing Text: Brave Demon Hunter's Armor
・Smithing Text: Demon Arm Cestuses