Black Clover Episode 15: The Diamond Mage
Episode 15 of 170 of Black Clover, aired January 16, 2018, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Yuno, Klaus, and Mimosa from the Golden Dawn appear in front of Asta and Noelle, apparently sent on the same mission. Klaus mocks the Black Bulls for their awful reputation and gets in an argument with Asta.