Underground Laboratory

Onimusha: Way of the Sword guide · Musashi uncovers the demonic research chambers hidden deep below Nijo-jo Castle

While exploring the subterranean facilities beneath Nijo-jo Castle during the mission "What Lurks in the Shadows," Musashi uncovers Dokyo's twisted breeding and experimentation chambers. Players navigate through multiple underground sublevels, survive ambushes by mutated test subjects, and shut down experimental contraptions to track down a lost key. Reaching the facility's deepest corridors requires solving environmental contraptions and clearing out the Genma overseers guarding the path.

Related quests: What Lurks in the Shadows

Items

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Power Stone: Inside a special treasure chest on Underground Level 3Fine Silk Cloth: In a treasure chest discovered after stopping the mechanism contraptionGore-Spattered Key: Obtained on the lower level after navigating the surgery platform and pitfall path to unlock the central doorGenma Note - Chijiko: Located inside a special chest found within the laboratory chambers

Secrets

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Unsettling Mask | Found by shooting the decorative wall masks in ascending numerical order corresponding to the total openings on their faces (mouths, eyes, and slots)

Enemies

Chijiko

Weak to Giant eyeball on its body (vulnerable to the Oni Bow)

Uses a bladed tentacle that can be parried, turns its arms blue before attempting an evadable grab, and will roll toward targets at long distance

Tips

Vacuum up loose demonic souls as quickly as possible with your gauntlet during combat to prevent transformed samurai from absorbing them and becoming empowered.

Not listed for this area: shops and people.

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Nijo-jo Castle

Kyoto Imperial Palace

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Sources checked: youtube.com, ign.com, rockpapershotgun.com, techwiser.com