Lit.: "vengeful ghost"; the spirits of those who died in the Sengoku period who are still so filled with rage and hatred that they continue to exist in the world as vengeful spirits instead of being purified and reborn.
Glossary: onryou
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onryou (怨霊)
Referenced from: Mirage 1, Mirage 2, Mirage 3, Mirage 4, Mirage 5, Mirage: Saiai no Anata e, Mirage 9, Mirage: Shinku no Hata wo Hirugaese, Mirage: Gunjou