Two gods

After betting their respective powers over which of them was the most powerful, the two gods of Balance, Harmony and Chaos, sent a prophecy to the temples:

"Two prophets will be born. One within the temple in the capital of Hybe, where he will live and grow to become a Saint. The other in the streets, where he will grow strength and hatred against his peers, destined to be a tyrant. One is humankind's salvation, the other its doom."

If the first of the prophets vanquish the second, Chaos will loose all powers and become a wandering god.
If the second succeeds in becoming a tyrant and kill the first one, Harmony will be deemed the looser and Earth will be owned by Chaos.