Nico was visiting the underworld by order of his father, Hades. Apparently, there was a meeting, and all the children of the underworld, plus Hades and Persephone, were supposed to attend. Nico knelt in front of his father. Hades was sitting on a big throne, with Persephone sitting right next to him in one of her own. "You wanted to see me, father?" Nico asks in a slightly annoyed tone. "Yes. Patience, my son. We're just waiting for a few more to arrive." Hades says calmly. This confuses Nico, as he thought he was the only child of the underworld since Bianca died. That is, until, he saw the door of the throne room get pushed open...