Rowan did not know the precise moment that his Origin Ouroboros Serpent entered the realm of Oblivion, but he felt it.
Inside this realm, it was impossible for any of his senses to penetrate outside his body, and for any outside stimulus to reach him.
A god could be screaming beside his ears and he would not hear them, at least, that was what would have happened two years ago when he entered this layer of the void, but two years was a long time for someone like Rowan, and his reach and his understanding of Oblivion had only grown stronger in that time period.
Standing still would increase the time it took him to understand this layer of the void, but he had still made great progress. Now, his senses could understand everything around him for millions of light years, and he could see the entirety of the Primordial Ouroboros skull.