Hera released this final attack down towards the grey rot, wanting to see how well spatial displacement would work. Draco had once told about how the grey rot attacked him when he was at the peak of the Tower of Babylon and wanted to enter the Divine Realm from its special passageway.
Luckily, he had managed to blast it back using his bloodline energy and then trap it in the sub-space between realms. According to Draco, there was something apparently even more terrifying within sub space that had caused that split segment of the grey rot to be filled with endless fear, but he hadn't been able to see it.
Hera herself thought back to the First Inter-Player International Competition, when Kiran had first entered his Super Warrior 2 form, he had broken between the space between realms and attracted some strange existences into the main plane that the AI had to quickly seal up.