His actions gave humanity some protection from the things in the dark and according to Zeus, caused the Greek gods to lose their hold on the world. As an act of revenge, Zeus chained Prometheus to a mountain somewhere in Europe and cursed him to die everyday and have his liver eaten by an eagle.

Who killed Prometheus?

For his crimes, Prometheus was punished by Zeus, who bound him with chains and sent an eagle to eat Prometheus' immortal liver every day, which then grew back every night. Years later, the Greek hero Heracles, with Zeus' permission, killed the eagle and freed Prometheus from this torment (521–529).

What happened to Prometheus after he was freed?

Prometheus, in eternal punishment, is chained to a rock in the Caucasus, Kazbek Mountain or Mountain of Khvamli, where his liver is eaten daily by an eagle, only to be regenerated by night, due to his immortality. The eagle is a symbol of Zeus himself.