Tantalus's geography is predominantly gently-rolling plains of a grass that grows gold when young and ripe and turns a dark olive green when dead and dry. All seems peaceful, but some of the grassland predators here make crocodiles and lions look like a picnic in the park.
Atmosphere: 72% Nitrogen, 12% Argon, 9% Oxygen, 7% trace elements (Cannot sustain human lungs)