Location: Milky WayMinos WastelandArrae System Fourth planet

Prerequisite: Priority: The Citadel II (Mass Effect 3)

Description[edit | edit source]

Nirrus, a moderate-sized hydrogen-helium gas giant, is of mild interest to turian scientists because of its abnormal atmospheric composition. The planet has only a fraction of the expected methane, with high levels of carbon monoxide and ethylene instead.

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