Chapter 320

The Cause of All This (元凶) is the 320th Page of Yūki Tabata's Black Clover.

Summary
Lucifero ducks out of the way of Asta's attack, but the Demon-Slayer Sword slices off the tip of the devil's horn. Furious that his body was harmed, Lucifero grabs Asta's head, slams him into the ground, and repeatedly stomps on him. Asta and Liebe lose consciousness and unmerge. Suddenly, Mereoleona Vermillion punches the devil, while Dorothy Unsworth uses her Dream Magic to transport Asta out from under the devil's foot and into Charlotte Roselei's briars. Realizing that Anti Magic is effective in harming Lucifero, the captains resolve to protect Asta. When Lucifero punches Mereoleona away, Dorothy transports her fellow captain, stopping her momentum. Charlotte attacks the devil, but Lucifero stops the Scarlet-Braided Beautiful Battle Spear with his hand. He then charges through, knocking Charlotte and Dorothy aside.

Not wanting to be outdone by another peasant, Jack the Ripper jumps in and slams into Lucifero's side, but the devil is uninjured and throws Jack into the ground. Having learned from Asta's example that anyone can fight someone stronger than them, Nozel Silva lifts up Asta and hits Lucifero with several mercury spears. Although the devil punches Nozel away, the spears cover Lucifero's body and harden, restraining him so Fuegoleon Vermillion, Mereoleona, and Salamander can combine their Fire Magic and blast the devil. However, Lucifero emerges unscathed, knocks Mereoleona aside, and grabs Fuegoleon. He then throws Fuegoleon into Rill Boismortier, knocking out both captains and destroying Twilight of Valhalla. The second level's highest-ranking devil declares that the humans have lost.

Lucifero blames Asta for everything so he leaps over to Asta and slams his foot down, creating a small crater. A star floats in front of the devil as Yuno Grinberryall has teleported Asta over to him and Mimosa Vermillion.

Fights

 * Asta and Magic Knight Captains vs. Lucifero