Malagarrian

The Malagarrians were an ancient, long-lived species native to the Unknown Regions planet Malagarr, considered fools by at least some of galactic society. Their society was highly advanced, causing them to plumb the depths of their planet's natural resources. Eventually, they turned the entire planet into a giant reactor, which backfired on them — despite their technological prowess, they could not properly control the radioactive energies that now emanated from within their planet. Within a matter of weeks, millions of the Malagarrians had perished. Those very few survivors of the catastrophe moved underground in an attempt to escape the radiation, but they too would eventually succumb. In the end, only their droids remained.