[[Kayneth El-Melloi Archibald]]'s Mystic Code, which manipulates mercury as a means to attack or defend. Usually depicted as a silver/grayish blob, sometimes with a [[:3]] expression.

It was later turned into the maid golem [[Trimmau (fate)|]], servant and bodyguard to [[Reines El-Melloi Archisorte]].

h4. External links

* "Type-Moon Wiki: Volumen Hydrargyrum":[https://typemoon.fandom.com/wiki/Kayneth_El-Melloi_Archibald#Volumen_Hydrargyrum]