S02E18 - The Di-Gata Redemption

The Defenders respond to a distress call, only for it to be a trap made by the Ogaman Federation, led by Bo, who arrests Erik for destroying the Tome of Al-mortigar. As he was being imprisoned, the Wizard stone put him a vision, revealing the third icon, protected by a monster. Before the Defenders leave, Erik makes Adam promise to look out for Kara. Erik is put with a cellmate who thinks he's a wizard. Worse, he accidentally gets into a fight with the prison muscle, who had connections with the guards. While on washer duty, he hides from the guy, learning that he is working for Malco to force him to reveal the icon's location. He sends a pigeon with a message to the others, who tried to appeal to the judge but were rejected. He is soon attacked. Afterwards, he is sent to solitary confinement. Outside, Kara tells Adam that taking the Tome was stupid and as Defenders, they should uphold the law. When they receive Erik's message, they go to Bo, who won't help until he gets a call that there is a prison riot. While everything is happening, Erik (with two stones engraved with Mal-ra and Orn-ra) flashbacks to when Kara found his stones and tried to be like him, accidentally stinging her legs. He wakes up, finding his cellmate in his cell, taking him elsewhere. Beneath the prison, it is revealed that it is also a prison for a creature called the Rath Marak that is not of Rados, which caused a human transport to crashland long ago. According to legends, a wizard who mastered the lost sigils was able to contain it, with the cost of his life. The monster was released and ate the prison muscle with his two companions. Erik was almost eaten as well, but the Defenders arrive and Kara saves him. However, every time the creature was hit, it gets bigger and stronger, it even withstood the Nova Stone. With no choice left, Erik uses the two stones to drain its energy, but the power was too much. Kara tries to help Adam when he is stuck under a large chunk of stone, but he insists that she should help her brother, so Kara takes his place. The creature is destroyed but with a great cost: the loss of Kara, whose spirit now lives within the life stone.