For this Onimusha Way Of The Sword guide, I'm going to be showing you the locations of all the Oni Armaments to get the Oni Armory trophy.
The first 3 Armaments are unmissable as they are part of the story progression, however the other 4 are likely missable, this guide will be showing you the locations of all Oni Armaments.
For the first Oni Armament, you have to release the Genma binds inside a cave in the north of Kiyomizu-dera Temple. You will see the chest being held up by red binds, and after taking out the spider to the right, the chest will drop, and inside are the Two Celestials.
Oni Bow
The Oni Bow is totally unmissable and must be collected to advance the story. You will collect this one from a chest before immediately having to use it to clear the path to advance.
Wind-Whipper
The next Oni Armament will come as a gift from Takamura after you do the first session in the practice grounds with him, so is also unmissable.
Earth-Shakers
After making it further down into the Underground Laboratory after the spinning fan puzzle, make your way up into the room climbing one of the blades.
Head left in this room and the chest will be by a wooden cell and a bunch of weaponry.
Firebird Flute
After sealing a rift in the lower section of Eastern Kyoto, a wall of corruption will dissolve revealing the chest behind it. In here is the nest Oni Armament.
The Flashing Void
For the next Oni Armament, make your way to Mount Oe and specifically to the Castle Entrance. From here, head down the lift and into the cave, shown below. In here will be The Flashing Void Armament chest to open.
Still Water
For the final Oni Armament, you want to make it to Arashiyama and specifically to Swamp I. From here head north up the long thin path where there will be red smoke, at the other end will be the chest containing the Still Water Armament.