Cold_Noodles
Ashborn is not just a monarch he was also a ruler. An equivalent of lucifer (darkness born from light) from the Bible even though his origin story is different. To be fair if it's really tensura then he probably has nothing to fear (except for the plot) as the cardinal world is impossible to be broken into completely by anything short of an outer god (if tensura lore has anything to say) due to its specialty. I'm guessing Nyx probably only sent an avatar in the form of a message because he aroused her interest in some way (the part about other gods wanting to kill him was probably a white lie because if they knew his potential they'd want kill him but I doubt they would notice anything past dimensional barriers).