History of Tonic Laboratory

The Tonic Laboratory is the private lab that Eido and the Guardian use to experiment with Tonics, in the Market District of the Last City in Episode: Revenant. Guardians upgrade it by recovering technology through Fieldwork. The Act I Key Fieldwork, given by Eido and started after the Major Fieldwork, ends with installing the Liquid Chromatograph using a Scorn Crossbow found in the field.