The original Zarathustra (Century7/6BC)
1 Posited the distinction between Good and Evil
2 The meaning of the world as a Moral Event.
This war between good and evil first emerged as a separation/disjunction of an archaic deity called Ahura Mazda into Vohu and Angro.
So, we see a world consisting of: 1 An ethical opposition and 2 A metaphysical opposition, between contradictory principles of existence. And thus a makeshift regime(s) of Good and Evil becomes the reality and meaning of the world.
Such a regime is neither 1 An endless Heraclitean opposition, nor 2 An alchemical marriage. What we have instead is a war of attrition, an endless battle, a focus on winning or losing.
Nietzsche has a different take on Zarathustra, creating his very antithesis: 'And thus they parted from one another, the old man and Zarathustra, laughing as two boys laugh. But when Zarathustra was alone, he spoke thus to his heart: "Could it be possible! This old saint has not heard in his forest that God is dead!"