Ooooohhh the one that Lucas harshly rejected before?! That makes sense!
He is Anastacius but at some point the strongest Emperor in history but the weakest in Lucas eyes (forgot his name) begin to possessed Anastacius (those black aura that keep whispering to Anastacius), but he is still has his own consciousness, it only recently that both souls completely merger(I don't know if it make sense, just reread a few chapter back)
The new Ch is going to know.
That really carax
Not anastachius
I am not sure the story change different in light novel.
In my opinion. This not anastachius, this carax or illegitimate child from first emperor (he really fans lucas) but he can't be king cause he didn't have strong magic like everyblood noble king (he meet lucas when the first emperor introduce him), lucas really don't like him cause he mixed ( I think he make a black magic and become magician so he can long life like lucas).(▰˘◡˘▰)