Avaritia is the Latin word for "greed". One of the seven deadly sins. This series is about how greed eats people up, controls them, and turns them into a completely different person.
They take everything that they can get. They will never stop. They will never be satisfied.
But that is all, this is the day when they can't take anything from anyone anymore.
This is the day they're forced to give everything they've got, until there's nothing left.