The Megalith has been destroyed and the new defender Rion joins the group. While the group is helping the citizens of Arboth to rebuild the city, Zad captures Kara that is brought to the Dark Realm.

Malco and Flinch attack the Defenders and stole the Nova Stone from them. But they are in a hurry to save Kara from the Dark Realm before the Equinox, so Seth decides to put off the issue. Meanwhile Brackus betrays Kara and tries to escape first, but is left to contend with the wrath of Leizel.

The Defenders find their new dojo, but it turns out that it needs a little work and cleanup. Erik and Mel are in the library when they find a receiver stone, which has recorded Doku and his fellow warlords in their discussion about taking over RaDos. When they arrive Rion's impatience causes a battle to break out, leaving Seth poisoned at the hands of Doku. They follow a rumor about a mysterious healer, with the power to cure anything.

A monstrous guardian appears at the dojo; while the Defenders are about to fight it, Bo shows up presenting it as his new guardian. They learn that Bo acquired it from Si'i, a black market guardian salesman.

The Defenders must now recover the Nova Stone stolen from Malco and Flinch so, while Erik and Rion are left to train at the dojo, Mel and Seth go on their search. But Kid Cole comes back and takes over a mining town, forcing the peolpe to extract Dakocite for him.

The Defenders and Brackus reunite at Port Reevus. They are now on the search for Brim, who is imprisoned on a far island. The Defenders get to him first and free him but then they have to fight against a dangerous creature named Yar-Maroth, so in the meanwhile Malco and Flinch manage to escape with Brim.

The Ethos use their power to merge together in Malco's body. Meanwhile, the Defenders try to find the cause of Rion shape-shifting into dark incarnate. Melosa has a vision that shows her the location of the temple of Yan-Sumos, where the Wizards of Yan first banished the Ethos, so the group leaves the dojo to find answers.

Erik, Rion and Brackus come upon the wreckage of the monastery where thankfully Seth and Mel have survived the collapse. Meanwhile, Malco and Flinch order all Zads to take care of the remaining Defenders. Mel finds an Eternity Stone and Brackus and Rion explain that the Wizards used those to travel through time. Everyone think that it's too dangerous but Mel does not heed their warnings, and travels back in time to the siege of Yan-Suma, when the battle against the Ethos is ongoing.

After a dispute about Brackus, Seth decides to leave Rion at the dojo and brings the other defenders with him to check out a distress signal. The Zads kidnap Si'i from the Gatashin Prison in order to get information about modifying his Guardianizer. Malco realizes that Rion is a large threat so wishes to get rid of him by transforming him into a guardian. While the Defenders are still away, Rion responds to another distress signal, which turns out to be a trap.

Mel finds out the location of the first Icon, but then a distress signal leads the Defenders to a port city where they meet a man shooting at a Sigil Slayer, which is eventually defeated. Von Faustien tells them that after the war against the Ethos left him whit no family he dedicated his life to hunting down those Ethos war dogs. Then he shows them to the tomb of Yan-Mara where the first Icon is located, only to find that a woman, Lady K'tash, has gotten there first and is waiting for them.

Kara sneaks in Ethos base and steals the Orb of Ogama-Yan. Meanwhile Seth manage to activate the Wizard Stones and has a vision of a swamp, but when the Defenders arrive at their destination they sink into the ground. There they meet Geo and her grandmother who live underground and secretly guard the second Icon.

Lady K'Tash awakens a giant golem and implants a Champion Stone in Seth's hand, hampering his healt and his possibility to cast. The Defenders need Brackus' help but, after traveling to a desert town, they only can find another healer who turns out to be actually Adam. Meanwhile Atagor-Am traces the Defenders down, attacks them and carries off Mel.

Doku and his cohorts, whit Adam's help, reactivate an ancient tower of the Wizards of Yan that is able to absorb Rados energy. Meanwhile, Seth is having a hard time adjusting with his new condition. When the Dojo's systems detect the tower, and Mel, Erik and Rion leave to stop it, Seth tries on the unstable mech arm that Erik was designing for him.

Kara comes back to the dojo, but she acts very strangely and not her normal self: she disregards Seth's leaving and doesn't seem to be disturbed by Brackus' change of heart. Meanwhile Seth meets Aaron, a former soldier of the Yin-Tos army, who host him in his house and offers to help him with his condition.

A noble girl named Lydia calls on the Defenders for help when she is suddenly attacked by the Amphitigons; Mel, Erik, and Adam rescue her but she tells them that the Amphitigons have stolen a precious Heart Stone and captured her brother. Seth and Rion are back to the Dojo, but while testing out the new mech arm Erik has made for his friend they are attacked by the Zads, who have managed to avoid the security system.

Lady K'tahsh plans to capture Si'i by using Melosa as a bait to draw him towards the village, but Rion saves her in time. Seth, Erik and Adam have just arrived back at the dojo from their mission when Kara insistently asks again about the Tome of Al-Mortagar, but Seth doesn't have time to pay attention to her.

Kara is held hostage by the Mortagarians in their underwater lair because they want the Tome of Al-Mortagar in exchange of her life. The Defenders have two days to bring it to them but the Tome is guarded by the Ogaman Federation.

The soldiers of the Ogaman Federation, led by Bo, arrests Erik for destroying the Tome of Al-Mortagar. While being visited by the other Defenders, one of the Wizard Stones put him a vision, revealing that the third Icon is hidden in the prison and is guarded by a legendary creature.

Erik travels to an ancient mystic monument with hopes of bringing Kara back. The other Defenders storm Mt. Froza, but find that it has been abandoned. There Rion yells at Adam for sending Kara to her demise. Adam insists it was not his fault. Meanwhile Malco, K'Tash, and Flinch, with Si'i and a random young woman, arrive at an abandoned cave, where the girl is sacrificed with an Ethos spell to create a floating base. At Mt. Froza, Rion feels the effects of the spell and transforms, attacking Adam in rage. Adam flees, sporting a serious injury on his arm. Rion leaves, assumedly to finish the job.

A number of children have recently gone disappearing. The Defenders are busy searching when Erik finds an orb that's made of a metal not from Rados. Rion suggests he be bait, but he is captured. A crazed man, known as the Professor, is searching for evidence that humans are descendants of interstellar travelers. But in the mines is a virus that is harmful to the fully grown, but children are immune to said virus, which is why he's making THEM work. He sends Rion down through the hole to see what's down there, and Rion discovers an otherworldly ship.

Mel has a nightmare where Kor attacks her. She wakes up and the others comfort her. The Wizard stones soon surround Rion, giving them the location of the fourth Icon—at the Pinnacle. Erik stays behind to monitor, carve new stones and make dinner. The others make it to the Pinnacle but Kor had also arrived. In the ensuring fight, where the undead is invincible, Rion encounters his "other" self. Though he conquers it, Kor takes the Icon. He tells Rion to relay to Mel to meet with him at the Spell Zone, in a courthouse. Meanwhile, Brackus meets with K'tash, using a stone to control her and release the Ethos inside. He is protected through use of a spell, which prevents the Ethos from touching him. He gives an offer to the Ethos—control of the Celestial Abyss and sole consumption of all Di-Gata energy in Rados; the Ethos agrees. Back at the Pinnacle, the Defenders stumble upon a recording of Kor's trial. The Wizards punished him with the most barbaric and brutal punishment ever—Arkham Mal Rash, the most barbaric punishment that hasn't been used for centuries, only to be used when someone harms a fellow Wizard. Knowing that Rados lies in the balance and as the last Wizard, she holds the responsibility, Mel accepts the challenge. She meets with Kor, who tortures her a few times before they enter a duel to the death a second time. Kor was very mad that the Wizards didn't hear him, blaming them for not making peace with the Ethos, saying he did not have authorization and that he was trying to save himself. Mel knows that if he is to be freed, she must end it. So, she used her powers to throb her spear right through Kor, destroying him. She takes the four Icons just as the Courthouse collapsed. Meanwhile, two kids Erik encountered at the mine (Azura and her brother) where the ship was buried, broke into the dojo, claiming they want to be trained as Defenders. After a futile chase all around, Erik accepts them, but not before having them clean the dishes. Brackus, who j

K'tahsh finds out where the four Icons are—in possession of the Defenders (which they took from defeating Kor Yin'an). Meanwhile, Brackus is busy training the kids in brutal combat but they quickly best him. That's when Seth, Mel and Rion return. Reluctantly, Rion and Seth decide to train the kids. Erik continued on his carving of the Lost Sigils. But the materials he used from the Dojo cannot withstand the process. He goes to collect Dakocite from the mining town he previously saved. Brackus meets a small pet of the kids' which sprays a pink toxin in his face. Mel manages to clear it away with her powers, but the toxin makes Brackus fall in love with her. At the Ethos Citadel, Malco is tirelessly trying to subdue Si'i, the humanoid guardian. Flinch calls Brackus, who is still infatuated at being a Sigil Slayer breeder. In his confused state, Brackus tells Flinch to make a necklace of Sigil Slayer eyes. Eventually, Rion gets sprayed and falls in love with Mel, causing a mixed up love triangle. Seth then puts hard pressure on the kids, having them carry heavy objects up a mountain. After they've completed their task, Seth asks them why they want to be Defenders. Their response was they want to protect the Realm very much. Mel calls Erik on how to reverse the "love state": Dakocite Dust. The Ethos emissaries in Malco decide to personally take down Si'i. They then murmur their plans to continue using Malco's body until their plan is complete. Afterwards, the body will be destroyed. Managing to get away, Malco tells Flinch to run and send for help, just as the Ethos take over him. Meanwhile, K'tash breaks into the dojo, under the cover of the confusion that the creature's toxin has caused, but can't find the icons. Mel accidentally gets sprayed, looks in the mirror and falls in love with herself. K'tash falls under the impression that Brackus is making a convincing distraction, with no knowledge of what had transpired here. Seth enters the room and breaks the confu

Brackus continuously trains Roodu and Azura with a Sigil seeker, ignoring their pleas to try casting real stones. When he leaves them, they seem to be hiding something. Meanwhile, the Defenders discover that the Von Faustien's Ethos parasite is missing from the vault. Just then, Maia (whose magical vision has changed, allowing her to see the future) arrives with a whole group of kids wanting to be Defenders. Suspicious, Seth interrogates Roodu and Azura about the vault but they claim they don't know anything. When he leaves, it was revealed that Roodu took Brackus' Guardian stone. Seth then suspects Brackus and has Mel check his tent. Inside, she finds a locket with a picture of a much younger Brackus and a woman who looks like K'tahsh named Torash. She then finds a recorder detailing that Brackus hopes to earn everyone's trust. She brings the recording to Seth, who is in the process of strangling Brackus, just as the Ethos container falls from Maia. Suspicions change and Seth banishes all the kids from the dojo after discovering that Roodu and Azura stole Dark Viper and caused it to go on a rampage. Brackus offers to take the children home, but instead he gives them a map, offering them a chance to train under him in secret. He goes his own way on his stormer. When he's alone, he contacts Flinch, who is in charge of caring for the sigil slayers, but he had bred them to be controlled by an unspecified crystal. But once the conversation is over, he is attacked by K'tahsh, who was eavesdropping on the communication. While fighting, Brackus tries to explain that he was trying to barter for K'Tahsh's life so they could rule Rados when the maelstrom is over; she relents. He sarcastically remarks that he should have married her when he had the chance—if he had not left her to the mercy of the Ethos. Back at the dojo, the Defenders have left no stone unturned in search of the Ethos, and come to the conclusion that the Ethos parasite perished due to a lack of a host. B

The fifth icon is revealed to Rion in a dream. He leads the defenders to a place where, weird people control a creature in an attack against the defenders. Erik falls behind, and as Seth rushes to help he is taken by the spider and about to be eaten, before a strange sphere falls out of his pocket. The weird people cease and worship the great relic of The Creator.Meanwhile, at the dojo Maia and Roodu are employed by Brackus to get the icons and on the way, meet Darr. Maia has a vision, in which Brackus is destroyed by Seth. Back with the defenders,Seth claims that they are leading them to the wizard tower, but it actually turns out to be the wizard tower. It takes off to another realm where their Di-Gata stones are dead, and the same virus seen in The Lost Children is lurking. The defenders are affected by this virus as it turns them into RaDos primordials. The weird people are destroyed by Doku in the wizard tower. Seth and the others leap onto the wizard tower as it takes off, but Doku grabs onto Seth wanting the fifth icon. Doku falls to his doom. Back in RaDos, the defenders, all except Rion, change back to normal. They find that Brackus has been attacked by K'Tash and Malco and they now have the icons. As they rush to help, Brackus thinks Seth is Adam and reveals to them that he was in the making of betraying them. Seth pulls out the weapon from his chest and Maia, Roodu and Darr return, running away thinking that Seth destroyed Brackus. Mel tells them that it doesn't matter, because right now the only thing standing between Malco and destroying RaDos is the fifth icon, currently in her possession.

Malco uses the Celestial Abyss to open a portal to the Dark Realm. Rion comes to stop him, only to be laughed at for the restraining sigil on his forehead prevents him from using his full power and is simply blasted away. Rion then wakes up looked in the mirror, still in his prime Radosion form. Angry, he shatters it. Meanwhile, the others are erecting defenses around the dojo. Seth goes out for a recon mission. While Erik is digging trenches, Rion comes, demanding that they remove the restrainer, but Erik doesn't know how. Furious, Rion runs off, not knowing that Erik picked up a massive amount of sigil energy emanating from him. After a talk with Mel, she uses her powers to find out what's wrong. Then suddenly, an Ethos comes out of him. After a small battle, Rion comes to his senses and encases the Ethos in an orb, which gets electrified. Going for the next step, they decide to restore his original form. At the Ethos citadel, K'tash rides on Si'i, ordered by Malco to retrieving the last Icon. K'tash then leads a legion of sigil slayers towards the dojo. Their movement is spotted by Seth but he is ambushed by a few strays. He defeats one, but gets detached from his mech arm. He is saved at the last moment by Maia, who warns him that the others are in danger. At the dojo, Erik (in carver robes), prepares to use an intimidating-looking machine on Rion but something goes wrong and another ethos comes out of him. The second Ethos explains that Rion is formed of Ethos essence and only he can stop the others. Erik defeats the Ethos using the lost Sigil stones. Once the Ethos is gone, Rion is restored to his normal. But an attack from the sigil slayers disrupts things. They bypass the wall and are held back by auto defenses. Seth returns just in time and Erik reattached his mech arm. As they prepare for battle, Rion leaves to face Malco alone. But things turns for the worse when a fleet of Mortagarian airships join forces with the slayers.

Rion arrives at the Ethos citadel, his arrival seen by Maia. He tries to fight Malco but the giant simply awakens his Ethos side. He gives the last Icon, completing the Celestial Abyss. But Malco had no intention of freeing his brothers, just to simply feed on their energy and become a god. Meanwhile, at the dojo, the Mortagarians demand the Icons but Seth said that Rion took them. The leader informs him that Rion is a failed Wizard experiment meant to use Ethos-created warriors. Erik accepts that humans did invade Rados and offers the Mortagarians his Primordial stones as a peace offering and asks their help in defeating the sigil slayers, so they could build a new future together. The leader is pleased with such an act and allows Erik to use the stones in battle. But as the fight goes on, the Defenders and Mortagarians are overwhelmed and forced to fall back. Adam comes in and saves Mel, who was pinned down by rubble. When they try to retreat back to the dojo, their path is blocked by K'tash and Si'i. Erik uses the Primordial stones to seal K'tash beneath the earth, causing the slayers to go wild. The Mortagarians remain to deal with the rest of the slayers while the Defenders follow Si'i to Malco. Malco becomes alerted to their approach and sends Rion to stop them. With his skills, he nearly kills them but Adam uses the Phase Stone to remove the restraining sigil, bringing about his beastly form. His Ethos side tries to regain control but Rion returns to normal. Together, they go to face Malco. But Rion's encasement attack is simply repelled, throwing them against the wall. Malco prepares to destroy them only for his true personality to expel the Ethos from him. Angered at his betrayal, they kill him. Rion transforms into his other form and takes out two Ethos but the remaining one subdues, only to be attacked by Si'i, whom Rion was able to call in the ancient language. The Ethos simply turned him back to human and threw him out of the citadel. Absorbing tons