Poseidon is the Greek god of the sea and is the third fighter of Ragnarök for the gods. He was the most fearsome among all the gods and the first of the gods to fall. Poseidon constantly despises many things, from humans to other gods. Poseidon was born as the third brother of the oldest Greek gods. He seemed callous and apathetic from birth, paying no attention to his older brother, Adamas, much to his chagrin.