Beginning with the Seraph of the End and Traveling Across All Realms

Once you have seen the vastness of the sea, you are destined to be unable to bear the obstruction of the river. Once you have seen the infinity of dimensions, you are destined to be unable to accept living in a corner. By chance, after seeing the beauty outside the world, Eli decided to leave this world that had long been ruled to the point of boredom. Even if it costs the whole world, Eli will not hesitate. With his loyal subordinates and the key to the dimension in hand, Eli opened the door to the endless dimension. (Note: The protagonist's subordinates are all based on Overlord. In order to arrange their appearances reasonably, the author made some small changes.)