There were eleven people primarily involved in the suffering of Ruru and the creation of the Death Relic. Because the Death Relic believed that their existence tainted its Legend, it wanted them dead by the hands of a cultivator who would become its master. When that happened, it could ascend to a new level of strength.
Atlas knew their faces, and though he did not know their names or positions, they weren't hard to find at all.
The person who led the entire operation was the city's mayor, a man named Enen. The other ten were his closest officials. Even without doing extensive research, when Atlas returned back to the city, he was easily able to find these people's identities by describing them to the citizens.
Temporarily, he left Ruru behind. That wasn't to say the young dragon was still in the underground facility. Atlas made sure to confirm which of the eleven officials Ruru specifically had grudges against and put them aside as the first targets.
