Zelnos Blood Curse isn't exactly a small character. His position in the family is decent, arguably a mid-level cadre.
He isn't uninformed; with over a thousand years of life and numerous experiences in looting outside, he could be considered well-versed in the world.
When it comes to something that can be considered an important target in the Infinite Starfield, it is, of course, the reason for the name of this starfield: the Infinite Legion.
In legend, there is a prophecy:
[The son of the youngest Evil God, who most venerates rationality, will return to the mortal world in the Era of the End, deciding the final fate of the Spirit Race.]
This prophecy is quite thought-provoking. Each element needs to be pondered over a bit to understand its meaning, and there are many different directions for interpretation.
Who does 'the youngest Evil God' refer to?