What does it tell us about their sense of an afterlife?

In the dream, he was all alone on a dark plain, and a man with a lion’s head and an eagle’s talons seized him. He fought this creature, but it overpowered him and changed him into a birdlike creature. Then he was dragged down to the underworld. There he saw kings, gods, and priests, all of them dressed in feathers. All of them were living in total darkness. They ate dirt instead of food. Queen Ereshkigal, the ruler of the underworld, sat on her throne, and Belit-Seri, the scribe of the gods, whose tablet tells everyone’s fate, knelt before her. Enkidu says the queen looked at them and asked who led them there. Enkidu tells Gilgamesh that he would have been blessed if he had died in battle, because those who die in battle die a glorious death. Enkidu’s condition slowly worsens and he suffers for twelve days before he dies.