It requires to you to die from the explosion of Adam’s armour. Adam is the final boss in the game.
If you fight the normal Adam, you need to make him walk through the small pool of lava, which is in the middle of the room. His armor will be burning red. It will glow brighter and brighter until it explodes. So keep your health very low and try to be close to him.
If you get to fight Adam in his most powerful form, his armor will start to glow white automatically after losing around 30% of health.