Ongyo-ki is a Persona of the Hermit arcana. It specializes in Physical attacks. Its default level is 83.
One of the four oni controlled by Fujiwara no Chikata. By eliminating its aura and preventing others from sensing its presence, it was able to surprise its enemies.
How to Obtain
Ongyo-Ki can only be obtained by a Cross/Quad-Fusion between Kin-Ki (Chariot), Sui-Ki (Moon), Fuu-Ki (Star), and Oni (Strength) once you have maximized the Hermit arcana with the Fox at the Tatsuhime Shrine.
(With the bonus experience from having the Social Link at Rank 10, you will be able to automatically learn the final Skill Set skill, Firm Stance. You can then take Ongyo-ki to Chagall Cafe and drink the coffee to receive this Skill Card.)