Relic planets

Relic planets were planets that could survive the exposure to extreme heat, such as the phasing of a star. In 2169 CE, scientists hypothesized that Relic planets could survive the heat because of the rare mineral known as Symesium. Relic planets that were located in Citadel space were forced to enable all species to live, the only species that weren't allowed were Quarians and Cherovs as the resources were not suitable for them.