After taking down the Giant Goblin King, which took quite a long while and a lot of energy, Adam went back over to the Core Part of the Goblin Beast City, using his Burst Movement Skill, to recover.
In the process of taking down the Giant Goblin King, Adam had taken down thousands of other goblin beasts by leading the Giant Goblin King to follow him and crush them all with his feet.
He had also caused a lot of destruction in the Inner Part of the Goblin Beast City and kept him away from the Core Part of the Goblin Beast City so that he could still attempt to salvage some things from the rubble of the Giant Goblin King's tower.
Adam was drained quite heavily after the long battle that required him to use a lot of Internal and External Energy to maintain the use of the Burst Movement Skill and continuously strike the Giant Goblin King's open wound.