Magni went to see Sif, whom Thor had banished from New Asgard years earlier, for advice. She told him about Thor's past as a noble hero while Asgard was still at its peak under Odin. Then she told him about the day Asgard fell, the same day she was banished from New Asgard. She revealed that her crime was daring to oppose Thor, Amora, and Loki in their plans for domination of Earth. Magni left Sif and returned to the royal palace, where he received word of Thialfi and Kya's failed assassination attempt on Thor. He witnessed the beginning of Kya's execution and would have tried to rescue her, but she used magic to speak to him telepathically and told him not to. After Kya's body was killed her soul led Magni to Mjolnir. He found himself able to pick the hammer up and, after learning to use it partly by instinct and partly under Sif's tutelage, he returned to the royal palace intending to test his father's purity of heart—if Thor could lift the hammer, Magni reasoned, his rule must be just and his actions righteous; if not, Magni considered that he may have to fight his father himself. When he challenged Thor to lift Mjolnir, however, Thor stalled, well aware that his murder of Jake Olson over 150 years earlier had rendered him unworthy. While Magni and Thor argued, Desak the god-slayer returned. After a pitched battle in which Magni was critically injured and several other gods were killed, Thor found himself able to lift Mjolnir again thanks to his pure intentions to defend his family and undo the wrongs Loki had done. Thor killed Desak and used the Odinforce to freeze time. He wished Magni a heartfelt farewell and promised he would never forget him, then returned to the past. With Tarene's help, he warned his younger self to ensure that the future he had experienced would never come about. Magni, along with everything after that branching point, ceased to exist.