The krogan are a fictional extraterrestrial humanoid species in the Mass Effect multimedia franchise developed by BioWare and published by Electronic Arts. A member of the species is first introduced in the 2007 novel Mass Effect: Revelation. The krogan are typically depicted as large reptilian bipedal humanoids who are physically tenacious, favor mercenary work, and thrive on conflict and violence. The krogan are native to the planet Tuchanka, which is presented as a post-apocalyptic wasteland as a result of the krogan's global thermonuclear civil war in the distant past. The krogan are presented as having a complicated relationship with the rest of the Milky Way galactic civilizations, especially the salarians; a past conflict led to the other interstellar species unleashing a genetically engineered biological weapon called the genophage on the krogan, drastically reducing their population and potentially driving the species to an slow and inevitable extinction.
