Mercury
Mercury is a magical resource, that is required to construct buildings and to hire Devils and Arch Devils, Ghost Dragons, Phoenixes and Azure Dragons. Mercury is produced in Alchemist's Lab and in the resource silos of Inferno and Conflux. Mercury can also be recieved from Everpouring Vial of Mercury, which is an artifact that produces one Mercury per day when equipped. Additionally, Rissa the alchemist has a special ability to produce one Mercury per day.