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After his battle against Yog-Sothoth, where his wife Iris and his children Eleanora and Dante helped him more than he imagined, Noah went back to Abyss with his family. The time dilation between the Outer Cosmos and the Universe and Abyss itself were quite big, but they didn't take hours, so he was hoping that not much time had passed back in their world while he was absent.
As the Blood God Emperor of Abyss, he had the responsibility of keeping the world's order. All the powerful families that dominated it would be endlessly wagging wars against one another if the Emperor wasn't there to stop them from stupidly killing each other due to their endless greed for power.