How does the Lord of Light dispute the battlefield?

If you want to clear the battle field of the Lord of Light, you must not touch the East Gate Three Monsters (the monsters in the red circle below). Once you touch any of them, the east gate will close and announce GG. In the picture below, except for the monsters in the red circle, the monsters on both sides of the middle road should be cleaned up. If your team is strong, you can destroy all enemies except BOSS and the three monsters in the red circle just now. If you don't choose to clear monsters, you can also push them one by one in the order shown by the arrow below, and directly raid BOSS breaks through.

After the breakthrough, the south gate opened, and the three untouchable monsters disappeared after cleaning up the enemies below. In fact, this part of the enemy below the south gate can be cleaned up if there is spare capacity, and it can be ignored if there is no spare capacity. Whether we fight these enemies or not, the disputed battlefield can reach the progress of 100%.