Porphyrion

Porphyrion is the king of the Giants, or Gigantes, in Greek and Roman mythology. According to most sources, Porphyrion rose from the mud created by the blood of the deity Ouranos. He is the most powerful of the giants closely similar to how Zeus is arguably the most powerful god (though rivaled by his brothers). However, he is also sometimes said to have been sired by the primordial deity of the abyss, Tartarus. Although this may have risen as a result of another version of the legend, in which the Giants rose from Tartarus after being imprisoned there by Kronos.He is destined to destroy Zeus.

History
In ancient times, the Titans such as Kronos and Hyperion were defeated by the young gods, namely the six children of Kronos (Zeus, Poseidon, Hades, Hestia, Hera, and Demeter) and by their allies. Soon after, however Gaia brought forth the Giants, who were solely born to avenge their elder siblings' deaths. By this time, all of the younger Olympians (Zeus' children) had been born, and were preparing the way for the new demigods. Porphyrion started the first war between the gods and the giants by kidnapping Hera after being shot with an arrow of Eros. This, of course, made him fall in love with the Queen of the Olympians, so he started the war to keep Hera and to avenge the Titans. Led by Alcyoneus and (of course) the king, Porphyrion, the Gigantomachy attacked Olympus. Warned by the Fates that the Olympians could not defeat the Giants without the help of a lion-skinned-mortal, Zeus decided that this must mean his son, Heracles, and sent Athena to find him.

Heracles defeated Alcyoneus after injuring him in the Giant's homeland, Pallene (where Alcyoneus was immortal) and then killed him outside of Pallene's borders. Porphyrion later dueled both Zeus and Heracles, but the combination of both god and demigod working together destroyed him, as only a god and demigod working together can defeat a giant.

The Lost Hero
In The Lost Hero, Gaea uses Hera's power to release Porphyrion from Tartarus, and is trying to awaken other giants to fight the gods. He is also a son of Gaea and Tartarus or perhaps Ouranos (paternity is uncertain). He uses a 20-foot spear for a weapon. He is the anti-Zeus, as he said, and as such nearly killed Jason Grace, if not for Hera being freed at the right instant. He rose at the Wolf House, which is the claiming location for the Roman demigods. He fought against Jason but fled after Hera/Juno was freed from her prison to avoid her wrath. However, Porphyrion did not give up, and followed Enceladus' plan to Greece by traveling through the earth (how fast he can go is uncertain). The giants' plan is to defeat the Olympians by destroying their very roots in Greece. It is foretold that demigods and gods must work together to defeat him and the giants when the time comes.

Appearance
Like most of his brothers, he is covered in bronze armor from the waist up with has scaled dragon feet. He stands probably over 60 feet which is about 18 meters and is extremely muscled. He has green hair, braided with many weapons (possibly of dead heros) and glowing white eyes, that resembles marble.

Abilities

 * His strength is enhanced
 * His armor and skin are regenerative
 * He made his spear glow (possibly electrokinesis, due to him being the bane of Zeus)