Eingana is a hot, beautiful, and deadly world, covered with the debris of ancient starships. Approximately 127,000 years ago, a series of battles were fought over it by two organic species, the thoi'han and the inusannon. Although no records of the conflict remain, most historians agree that both races wanted to colonize Eingana, and neither were willing to share. The two lost hundreds of ships in a series of battles over Eingana and its moon, Barraiya; many of these were eventually pulled in by the planet's gravity well.
The mass effect drive cores of these ships broke apart, dumping refined element zero over large stretches of landscape. This poisoned the environment and a wave of extinctions followed. Many of the animal species that followed showed a tendency to develop biotic powers. As the ecology of Eingana is energetic and aggressive, this makes makes colonization and a deadly peril.