The four levels are the four spirits transformed from the God of Death, as shown in the plot of Thunderbolt Warrior: Vitality Warrior.

1. The four gates of Death in the Thunderbolt Apocalypse are the four spirits transformed from the God of Death. Their physical form is unpredictable and can lurk in the patient's body and cause widespread infection. Only by forcing the four gates out at the same place at the same time and allowing them to merge, Only then can it be extinguished in one fell swoop.

2. The plot synopsis of Thunderbolt Warrior: The Vitality Warrior. A long time ago, in order to achieve the ambition of ruling the entire universe, the ruler of the Fantasy Continent made trouble and plundered resources. Under his leadership, the Dark Army will The black hand reaches out to the earth in an attempt to take possession of the earth's precious resources. However, they encountered tenacious resistance from the power of the earth. In the end, the Justice League, represented by the Vitality Warriors, defeated the Dark Legion after a bloody battle. The Dark Legion was driven back to the fantasy continent, and the Vitality Warriors sealed and imprisoned the evil leader on the continent. The tower made him regret his mistakes, and mankind returned to a peaceful life.