Black Clover: Season 1, Episode 168

1 - 168: Stirrings of the Strongest

Yami and Vangeance are taken to the Spade Kingdom so that the ritual to open the  gate to the underworld can begin. Despite how hurt he is, Asta tries to escape the imfirmary to go and save Yami, however he is stopped by a mage named Nacht Faust, who also happens to be a devil-possessed.