Of the many, varied species in the Mass Effect universe, quarians might not look like the most likely to win a war. Most of their toughness comes from necessity. There are a lot of reasons why these fragile-looking aliens are a contender for the toughest species in the galaxy. The Mass Effect series shows many ways in which one species creating another can go well or badly. The quarians created the geth, who turned against them.
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The Quarian are nomadic, bipedal sapients who must wear environmental suits at all times, as living in the sterile environment of the Flotilla has atrophied their immune systems. Many rumors exist as to their race in fact being cybernetic in nature - a perfect blend of biology and technology that allows them to survive in the vacuum of space for a time. Typically they stand a little under six feet, with a slender and thin Humanoid build. Though very similar in appearance to humans, they have several differences including backwards-bent shins and three fingers on their hands two fingers and a thumb. While quarians, like humans, have red blood and hair black being the only confirmed color , they have glowing eyes and inhuman skin tones the only confirmed ones being shades of light purple. Sexual dimorphism is similar to humans with two exceptions; quarian women have wide hips compared to a human of equivalent size while quarian males have similarly broad shoulders.
Mass Effect: Quarians Are the Toughest Species in the Galaxy
Photosynthetic life is concentrated around rivers and oceans, with large expanses of desert in between. The importance of plant life and shade in ancient quarian culture is evident in the translation of Rannoch's name--"walled garden. To a starship's sensors, the most obvious feature of the quarian homeworld is the numerous heat sources in orbit.
Qetsi was born on the liveship Chayym. Her mother died when she was a kid. When Chayym was attacked by the geth during the Battle of the Citadel in she and childhood friend Malak'Rafa vas Keelah Si'yah were considered to be the only survivors from it. She and Malak spent their Pilgrimage at a salarian biodiversity station on Erinle. The salarians pranked her one time by compromising her suit during a group outing, which resulted in her lungs getting infected by yelik algae.