Kyokukinkakin

The Kyokukinkakin (極金化 菌, Extreme Metallization Bacteria) is a specially bred, nano-scale capable of  objects via. It is the counterpart to Hankinzokukin.

After Kyokukinkakin is commanded to a desired location, or enters the body of a given target, the user can trigger the bacterium, causing it to convert the entirety of the target or covered area into a given metal within seconds.