Prometheus persuaded his brother to fight with him in reward, Zeus gave Prometheus the power of creating all living things, and Epimetheus added aspects to each one of them such as the ability to fly or breathe under water.
Meanwhile, Prometheus made the first ever humans out of mud but Zeus demanded they all remained mortal and worship Mount Olympus from below. However, Prometheus believed his creation was destined for more.
When he was asked how sacrifices would be made, he killed a bull and divided it in to 2 parts to show Zeus. On one side he put flesh and skin underneath the belly, and on the other he hid the bones under a thick layer of fat.