In the world Non lives in, their armies are all children of one holy vessel, who is non \o/
the prophecy vessels are being in which lay eggs/give birth to extremely powerful children, which are then trained and made to defend their land/territory/country

holy vessels are immortal, but can be hurt or injured to the point of not being able to lay eggs. if unable to produce offspring, they will be exterminated and a new vessel will be found.

it causes a lot of strain on their bodies, but most of them don't mind. they are pampered and revered as long as they live and so are their children.