Vatra is the second moon from the gas giant Pyro V, Pyro system. Its thick, high-pressure atmosphere of nitrogen and methane supports an ecosystem of plants that subsist on hydrocarbons instead of carbon dioxide. Some water is present on Vatra in the form of ice, but it is too cold on the surface for it to exist in a liquid state. Travelers who have harvested this ice in emergency situations report that, when melted, it is extremely bitter.