Krios

Krios (Ancient Greek: Κρεῖος), also known as Crius and Kreios, is the son of Ouranos and Gaia, the father of Perses, and the grandfather of Hecate. He is also the Titan of Stars and Constellations, the Lord of the South and is known as "The Ram", which explains the ram horns on his helmet in The Last Olympian. Krios sides with Kronos in the Second Olympian War. While Kronos was being defeated, Jason and his allies from the Roman Camp defeated Krios on Mount Othrys.

History
The least individualized among the Titans, he was overthrown in the Titanomachy.

Consorting with Eurybia, daughter of Earth Gaia and also Sea Pontus, he fathered Astraios and Pallas as well as Perses. The joining of Astraios with Eos, the Dawn, brought forth Eosphoros, the other Stars and the Winds.

Krios was inexorably involved in the eleven-year-long war between the Olympian gods and Titans, however without any specific part to play. When the war was lost, Krios was banished along with the others to Tartarus.

Physical Description
Krios was said to be wearing a set of ram's horns along with armour with stars on it.

Appearances
Krios was first seen in Percy Jackson's dream. He was on Mount Tamalpais, talking to Hyperion about Prometheus and the trap for the heroes. Krios grumbled about having to "babysit" Atlas. Hyperion burst into flames to join Kronos, leaving Krios. Krios also wondered why Hyperion could burst into flames while he had to wear the 'stupid' ram horns. Later it is revealed that Jason personally took him down during the Roman's assault on Mount Othrys.