Ambrosia is a major villain from the Samurai Shodown series, being the main driving force of the events from the first two games. It later appeared as the final boss in Shisetsu Samurai Spirits: Bushidou Retsuden, which is a retelling of the first two games.
Described as the Dark God of Makai, Ambrosia seeks to enter our world and spread chaos.
It tried to plunge the mortal world into discord but for this end it needs the Palenke and Tangil stones, which keep the gate to Makai sealed.
Mizuki almost succeeds, but as she is defeated by the heroes her soul is banished back to Makai along with Ambrosia, who is unable to enter our world as the gate closes.