The Sacred Knife is a weapon used by Kaede in Onimusha: Warlords and Onimusha: Blade Warriors. It is a holy knife blessed by an Oni monk with the power to dispel demons.
Trivia
- During Blade Warriors at the Ancient Castle (Moon), Magoichi Saiga comments on the blade to which Kaede explains that it holds the power of the Oni within it.