The Firstborns brought up idea of battlefields of the past.
When gods stopped answering the races and people startet beeing confused
about having ideas and having life plans on their own the firstborns were afraid
of unhappyness leading to agression.
Due to that fear of savage, Purpose of battlefields of the past has been kind of "employment"
in relation of agression, a place in which people can let out agression without damage and
death in their real lifes.
(>> thats kind of the idea of jesters purge day nowerdays
)