He was the one who originally decisively defeated the demons and taught people how to fight to demons. In the First War, The Deliverer led a human army according to the Creator's call and he destroyed all demons in the World. Thanks to him, demons did not come anymore to kill humans. He was the one who taught humans the wards of fighting and protection.
This myth has several versions but all agree he was a general and great leader of men.
The continuation of the myth for-tells the return of The Deliverer.