Because Enkidu helped kill the Bull of Heaven, the gods sentenced him to death. He slowly withered away, begging Gilgamesh not to forget him on the twelfth day.
Gilgamesh Travels to Find Uta-napishti
Gilgamesh mourned upon his best friend's death. He collected precious metals and other valuables to accompany his beloved to the Underworld.
Uta-Napishti Tells Gilgamesh the Story of the Flood
Haunted by his friend's death, Gilgamesh resolved to find Uta-napishti, the man who survived the Flood. At the mountain pass, the king was faced by two scorpions, although he easily convinced them to step aside.
Epilogue
Siduri, a tavern keeper, told Gilgamesh where to find Urshanabi , a boatman who could take him to Uta-napishti. When Gilgamesh arrived, he told the survivor his tragic story, but was told that, regardless, he was mortal and would die.
Gilgamesh began arguing with Uta-napishti, in denial. Finally, Uta-napishti told his story and advised him to find a plant to restore his youth. Unfortunately, the king's plant was stolen by a snake, plunging Gilgamesh into a second pit of despair.
Shamash, the sun god, opened the Underworld's roof to let Enkidu's ghost speak to Gilgamesh one last time. They tried to grab each other but couldn't. Enkidu refused to tell Gilgamesh where his body was because he knew it was too late to be saved, even by his beloved king.