Zerra Radiation is a highly mutigenic material, and is often released off Omniars (Due to their ability to cascade into slipspace with little effort). however some Omniars will emit a large dose of it to a planet that has a developing dormant species. the effects are always random, sometimes (like the case with humans and the Arcams) one race will develop at a rapid rate, while the other takes many star cycles to get somewhere, but most of the time it will end up killing the entire planet.
"We omit these particles to see which race will end up succeeding, as once a species starts to colonize their star system, its quite hard for them to fall. we have seen species become pets of larger and a much more stronger species. most of the time it becomes beneficial of the two, like with Aetherians and Keaths." ~ Omniar Arnulis