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.