User blog:Bato of the Heavy Iron Rock Hammer/What happens to the Etherious if they finally destroyed Zeref?

Been wondering that if the Etherious of Tartarus finally destroyed the Black Wizard Zeref, what happens to them now? Their main purpose is to destroy the immortal Zeref as he written them to and if they managed to succeed, what is their purpose now?

Although you guys knew the obvious answers of my question, I would like to know your opinions on this.