Irune

Irune is a large planet that has an atmosphere of ammonia and oxygen. It is the homeworld of the volus, a race of traders and slavers, like the batarians. Irune's atmosphere is thick, providing planetary insulation through a process equivalent to the greenhouse effect, which is why all volus must wear pressure suits and breathers when dealing with other species, as oxygen and nitrogen mixtures are toxic to them, and in the low-pressure atmospheres that support most species, their flesh will split open.