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Shin went to his dimension, which was the Reaper's Realm that he had 'gotten' after defeating Vladimir and forming the contract with that elemental spirit.
This place had completely transformed into an independent world as it was now filled with 'life' compared to the first time he had arrived here.
The dimension was still divided into different regions, which signified the respective territories of his Elemental Spirits. These places were also their rebirthing place, which was now connected to the physical realm of the Atlas World through Shin.
As Shin became stronger, his connection with his Elemental Spirits also grew, which also indirectly affected his connection with this realm.
At this moment, he no longer had to 'bring' all his Elemental Spirits around in the form of specks of lights revolving around him while traveling in the Atlas World as their connection became strong enough to traverse dimensions.
