All that kind of pre-established harmony Wagner left behind him the moment he deserted the heroes and villains of romantic opera for the visionary and true tragedy of gods and demi-gods, giants and gnomes, with beauty, nobility and love in the wrong, and the forces of destruction and hate set free by blind justice.
The heroes are spirits of the dead, not demi-gods; their position is not intermediate between gods and men, but by the side of these they exist as a separate class.
In Hesiod it is chiefly confined to those who fought before Troy and Thebes; in view of their supposed divine origin, he calls them demi-gods (µLO€ot).
This was ascribed to the naga demi-gods and rajahs of India and to the " king tt, of snakes " among North American Indians.'
But there are independent reasons for believing that they were originally gods or demi-gods.