Chrono Phantasma
A month after the events in Kagutsuchi, Relius was given a job by Izanami – to activate the cauldrons across the Ikaruga Region to enact their plan for Doomsday. He returned to the Magister's City of Ishana and asked about the condition of her vessel before delivering his report on the progress that had been made. Relius left as he complimented the Imperator on never boring him.[18] He learned that Azrael had been released from the Dog House and that Kokonoe had escaped. Relius correctly assumed that she would be heading to Ikaruga, and made his way to a lab where Litchi was working. Complimenting her on the work she had accomplished, he took over, and told her that he had made her Arakune's Observer. Immediately afterwards, he called Hazama and asked for a favour. He found Hazama later on and assured him that the vessel he prepared for Phantom was good and Izanami was sustaining him.[19]
Relius continued his job of activating the cauldrons around Ikaruga. When he arrived in the 9th Hierarchical City of Akitsu-Kou, he intended to activate the cauldron there, but found Jin Kisaragi blocking his path. Intrigued at the young man's ability to sense whether the cauldron was dead or alive, he still wanted to continue his mission. Jin blocked him, but both Relius and Ignis defeated him, with the Colonel employing a technique taught to him by Izanami to do so.[20]
In the 7th Hierarchical City of Kazamotsu, Relius called Litchi and asked her to look at seithr readings in the city, discovering that they had fallen and risen at inexplainable rates over the last three days. He incorrectly believed it to be the Lynchpin's doing, and had Arakune investigate. Carl found Relius and the two battled after Relius remarked that he would break his hatred, dodging questions about Litchi. After the battle, Relius promised Carl that he would rebuild Ada in the future when he was ready.[21] Arakune soon came back to report his findings to Relius, telling him that both Ragna and Noel were in the NOL branch in Yabiko. Satisfied, he wondered what Kokonoe would do with the Lynchpin and sent Arakune away to Hazama.[22] When Terumi and Phantom arrived from their journey in Yabiko, the God told Relius that Celica was in the modern world, resurrected as a Chrono Phantasma, piquing the scientist's interest.
Relius was present when Izanami ordered the destruction of Takamagahara. He told her that all the cauldrons in Ikaruga were activated, and Doomsday was soon to commence. Relius then took Litchi, Ignis, and Nu to the 8th Hierarchical City of Wadatsumi where the Lynchpin was waiting. He battled against Ragna.[23] When the Ex Machina: Minerva appeared to protect Celica and stop Nu from killing Noel, Relius complimented Kokonoe on its design. He stopped Ragna from progressing and told him that he had released all the cauldrons in Ikaruga, and that the world was insane since it repeated The Origin's finite memory. Carl soon joined his father in the battle, but thanks to Tsubaki and Makoto joining the opposition, Ragna, Celica, and Noel escaped. Relius and Carl made for an insanely strong team with their automatons, leading to the opposition having to take them on separately. Relius battled Bang alone.[24]
Valkenhayn appeared, battling Relius and giving Bang enough time to jump on top of the Lynchpin, which was teleported away by Rachel. Shortly afterwards, the flow of seithr in the world was halted. Relius had failed, but before Valkenhayn could kill him, Nirvana blocked the blow and the group retreated. He asked Carl why he saved him, and was told that he still had a promise to keep – Ada's revival. The mad scientist laughed to himself and told his son that he would make good on his promise.[25]