Arc 2

is the 2nd arc of Yūki Tabata's Black Clover.

The arc revolves around the exploration of a newly emerged dungeon at the border of the Clover Kingdom and the Diamond Kingdom.

Reunion
One day, a peasant who is walking in a forest suddenly encounters a ruin of building that had emerged from the ground. A few hours later, Yami Sukehiro approaches several members of the Black Bull squad whom are hanging out and informs them about an emergence of a dungeon. Hearing the news, all of the members become excited before Asta shows his ignorance regarding the existence of dungeons. The other members then start explaining to him that a dungeon is a place that contains a hefty amount of treasures, including powerful magic items, but also being guarded by countless powerful traps.

Vanessa Enoteca then adds that due to the danger of a powerful magical artefact being handed to the wrong hands, it is the duty of the Magic Knights to conquer the dungeon and secure the treasures. Yami then further explains that the dungeon had emergence on the border between the Clover Kingdom and a neighbouring country, the Diamond Kingdom.

After hearing all of the information, Asta quickly nominates himself for the mission. To everyone surprise, Yami reveals that the Magic Emperor himself has requested for Asta to explore the dungeon. Asta then immediately travels to the dungeon along with two squadmates, Noelle Silva and Luck Voltia. On their way to the inner-side of the dungeon, Asta and Noelle start arguing about the name of the anti-bird that they had met during their mission at Sosshi village. After several name proposals, they decided to use Luck's suggestion of naming the bird Nero.

Back at the Black Bull headquarters, Vanessa asks Yami about her curiosity around the Emperor's awareness of Asta but the latter simply said that their leader is weird. Additionally, the Black Bull's captain also assures her that Luck Voltia should be able to protect the new members. Although, he also remarks Luck's slightly insane personality.

After a brief walk in the dark, due to Asta accidentally dropped their source of light, the group finally reach the inner-side of the dungeon. Luck and Noelle immediately remark the dungeon to be full of mana in which Asta is quickly sulking due to his inability to sense them nor having them. However, during his tantrum, Asta suddenly activates a trap spell. After he easily neutralizes it, Luck suddenly pushes him into another trap. Additionally, Luck begins to activate several other traps before stopping and praising Asta's anti magic weapon.

Luck then begins sensing the presence of others inside the dungeon and quickly heads out towards the strongest person that he sensed, leaving the new members on their own. A moment later, another plant-based trap spell suddenly entangles Noelle but Asta manages to release her. However, the spell is able to strangle Asta as well before preparing to eat him. Suddenly, a rain of swords falls upon Asta and destroys the trap.

During that time, at the Black Bull headquarters, Yami informs Magna Swing that several members of the Golden Dawn were also tasked to conquer the dungeon. Back at the dungeon, when Asta and Noelle look up, they see the appearance of the members of the strongest squad in which one of them is Yuno.

Back at the Golden Dawn headquarters, William Vangeance is interrupted by a member, Alecdra Sandler. The said member inquires the captain regarding his decision to assigned the dungeon exploring mission to Yuno. However, William only asks Alecdra to trust his decision. Returning to the dungeon, the Black Bull members and the Golden Dawn members are facing each other with Asta and Yuno are delighted with their reunion. Unfortunately, Yuno's senior, Klaus Lunette, interrupts them and asks his junior the reason for his action of saving the Black Bull members. Klaus' remarks sparks a confrontation between the nobleman and Asta.

Furthermore, the female Golden Dawn member also starts a conversation with Noelle in which the latter reveals that she is her cousin, Mimosa Vermilion. While being passive-offensive, Mimosa begins to boast about her group's achievement of a star at their previous mission. Asta and Noelle then cheerfully reveals their achievement as well but Klaus brushes them off as lies.

Subsequently, Klaus also asks the Black Bull members about their missing third member in which both of them unable to give him an answer. Meanwhile, Luck is still cruising through the dungeon towards his target's location. When Klaus begins to mock the Black Bull squad, Asta challenges him to a race to see which squad could reach the center of the dungeon first. Accepting the challenge, Klaus orders Mimosa to scan the dungeon and Yuno to create a vessel for their transportation.

After the Golden Dawn members had left, Asta and Noelle also head towards the center. As they begin to encounter many creatures of the dungeon, Noelle questions their method of choosing the path as none of them is able to find the correct path. Seeing the two of them struggling, Nero takes off from Asta's head and points them at one of the paths. At the same time, the Golden Dawn members are traversing the dungeon towards the center. When Klaus begins to belittle the Black Bull again, Yuno reminds him not to underestimate Asta.

In the meantime, at the Royal Capital, someone reports to the Magic Emperor, Julius Nova Chrono, that the Diamond Kingdom had sent a group of mages led by Lotus Whomalt to conquer the dungeon. While the rest of his attendants are panicking, the Emperor is still confident of his Knights' abilities.

Back at the dungeon, Luck finally arrives at his target's position. After defeating all of his subordinates, he challenges the leader to a fight while confirming that he is his target.

Clover vs. Diamond
After observing Luck's abilities, the leader of the group, Lotus, decides to escape while proposing for a none violence competition to conquer the dungeon. Unfortunately, his opponent refuses as Luck charges at him. Lotus is able to dodge the attack with his smoke-based magic while also revealing his standing with the Diamond Kingdom. He then tries to explain his reason for exploring the dungeon and his Kingdom's constant invasion to the Clover Kingdom, but Luck tells him that he just wants a good fight.

At the other side of the dungeon, Asta and Noelle is still trying to find the correct path to the center while struggling in an area with an abnormal gravitational field. Asta tries to ask Nero's guidance but the anti-bird remains silence. He then notices a walking treasure chest just passed them and immediately captures it. However, when they opened it, they sees the chest's internal organs in which annoys Noelle.

The fight between Luck and Lotus continues with the latter in the defensive side. While observing his opponent, Lotus recognizes the robe that Luck is wearing as the Black Bull signature robe. He then begins to reminisce his fight with Yami and tells Luck about his defeat from the Black Bull's captain. The story quickly excites Luck but he suddenly starts feeling hazy. Lotus then reveals that he has been casting a weakening spell since Luck's arrival as the latter loses control over his body.

Somewhere else, the Golden Dawn members finally arrive at the center of the dungeon. As they are discussing about it, Mimosa is suddenly ambushed by someone. When Klaus demands the perpetrator to come out, the said man then reveals himself as he walks towards them and tells them to get out of his way.

Going back, at the fight between Luck and Lotus, the latter then decides to leave but the former quickly gets up and tries to attack Lotus again after hearing his mother urges him to win. The fight continues with Luck is releasing even more magical power. The Black Bull member then begins to reminisce his childhood days while living with his mother. He remembers that his mother used to slap him for his constant smiles and his inability to show other emotions. However, when Luck managed to defeat a noble at his school, his mother began to praise him while urging him to keep achieving more victories.

At the same time, Luck begins to put pressure on Lotus as the latter realizes that Luck is getting stronger even after he had weakened him. Lotus then decides to end the fight as he activates a spell that binds Luck and immobilizes him.

In the meantime, at the center of the dungeon, Mimosa activates a spell and begins to heal herself. The Golden Dawn members then notice the diamond symbol on Mimosa's attacker and assume that he is from the Diamond Kingdom. A fight then ensues between Klaus and Yuno against the said mage, Mars.

At the other side, Asta and Noelle finally find the correct path. However, when Asta hears an explosion and Noelle sensing it to be Luck, Asta suggests them to head there and give Luck a help. Noelle disagree with Asta while reminding him about their objective and Luck's own decision to leave them for his own agenda.

Returning to the center, the fight between the Golden Dawn members and Mars has reach a stalemate but Klaus realizes that they are being cornered as the fight drags even longer. He then orders Yuno to leave and conquer the dungeon by himself. Yuno tries to reason with him first but ultimately decides to leave. Seeing an opening for an attack, Mars binds one of Klaus' feet and launch an attack towards him. At the same time, after binding Luck with his spell, Lotus decides to put Luck out of his misery by trying to suffocate him.

Fortunately, Asta manages to arrive in time to destroy Lotus' binding while Yuno decides to turn his back and saves Klaus from Mars' attack. When Klaus questions his decision, it reminds Yuno of another vow he made with Asta where they would treasure their comrade like they care for each others. Additionally, when Lotus' asks about Asta's relation to Luck, he reveals that he is Luck's friend in which is a similar answer that Yuno gave Klaus when he asked him about his main priority on the mission.

Sadly, after remembering her mother's funeral and the promise he made to keep winning, Luck declines Asta and Noelle's help. He then charges towards Lotus but the latter yet again evades him and tries to launch a counterattack. Asta immediately interferes while reminding Luck that they are comrades. Hearing it, Luck has a change of mind and agrees to defeat Lotus as a team. However, Lotus also decides to stop fooling a round and activates a spell that traps all three of them inside a veil of thick smokes.

Meanwhile, the fight between the Golden Dawn members and Mars with Yuno finally releases the full extent of his magical capabilities. Klaus is taken by surprise when he realizes that Yuno has been keeping his strength a secret as the latter activates two spells concurrently.

Looking back at the Black Bull members' fight against Lotus, they are still struggling to break out of the ever replenishing smoke that the latter created. Luck the praises Lotus for his sensory abilities as the latter is still able to evade all of his attack amidst hiding within the thick smokes. Not long after, Luck suddenly notices something and devices a plan to defeat Lotus. He then starts by sending a barrage of attacks towards the Diamond Kingdom's mage. As Lotus evades the attacks to the side, he is ambushed by Asta whom is suddenly appearing from within the smokes. The latter swings his sword at Lotus and manages to inflict a heavy damage on him.

Luck then reveals his plan where he needs to guide Lotus towards a certain direction while Noelle launches Asta towards the designation position. After their plan succeeds, Luck expresses his delight on the notion of teamwork.

On the other side, even with his full strength on display, Yuno is being suppressed by Mars whom is finally using his grimoire in the fight.

Fights

 * Luck Voltia vs. Lotus Whomalt
 * Klaus Lunette and Yuno vs. Mars
 * Luck Voltia, Asta and Noelle Silva vs. Lotus Whomalt
 * Asta vs. Mars

Events

 * Blood Brothers Reunion
 * Hidden Treasures: the Sword and the Wind
 * Escape from the Dungeon