In history, religion and political science, a purge is a position removal or execution of people who are considered undesirable by those in power from a government. Everyone has their reasons to Purge, one does it for revenge, one does it for glory, one does it for fun, maybe to put themselves at a advantage when the Purge concludes.

But as for Hades Children

Those of whom had ruled purging in New York for many years

No one knows why they do what they do

But it's a week before the Purge

And they are here to keep their title