indeed he could not tell to Brynhild, were she not, as she says,
his own will--the whole story of Alberic and of that inspiration
about the raising up of a hero. She thoroughly approves of the
inspiration; but when the story ends in the assumption that she
too must obey Fricka, and help Fricka's vassal, Hunding, to undo
the great work and strike the hero down, she for the first time
hesitates to accept his command. In his fury and despair he
overawes her by the most terrible threats of his anger; and she
submits.

Then comes the Volsung Siegmund, following his sister bride, who
has fled into the mountains in a revulsion of horror at having
allowed herself to bring her hero to shame. Whilst she is lying
exhausted and senseless in his arms, Brynhild appears to him and
solemnly warns him that he must presently leave the earth with
her. He asks whither he must follow her. To Valhalla, to take his
place there among the heroes. He asks, shall he find his father
there? Yes. Shall he find a wife there? Yes: he will be waited on
by beautiful wishmaidens. Shall he meet his sister there? No.
Then, says Siegmund, I will not come with you.

She tries to make him understand that he cannot help himself.
Being a hero, he will not be so persuaded: he has his father's
sword, and does not fear Hunding. But when she tells him that she
comes from his father, and that the sword of a god will not avail
in the hands of a hero, he accepts his fate, but will shape it
with his own hand, both for himself and his sister, by slaying
her, and then killing himself with the last stroke of the sword.
And thereafter he will go to Hell, rather than to Valhalla.