The Heavenly Case is a set item that increases attack power by 777. It is a bottle with a pink mist surrounding it.
In ancient times, they were crafted from blessed metals to hold perfumes to calm people down. It was said because of this, monsters loathed the smell of these bottles. In the present day, the function the bottles perform is still the same, though there are rumors of a certain perfume, that, when held by the Heavenly Case, can ward off Fusions, maybe even weaken them.