Steropes the Lightning Bringer was one of the Cyclopes, hybrid-beasts created by the Isu as part of the Olympos Project. During the 5th century BCE, the beast was held in a cave within the Bay of Nobody on the Greek island of Andros.
In Greek mythology, Steropes was one of the sons of Uranus and Gaia, and his name, "Στερόπης", meant 'lightning'. Steropes and his brothers Brontes, Arges, and the Hekatonchires were cast into the pits of Tartaros by their father, who was repulsed by their appearance and fearful that they would usurp him. Kronos, who deposed Uranus shortly thereafter, freed them briefly before imprisoning them again. They were later freed by Zeus during the Titanomachy and forged his famed thunderbolts, along with Poseidon's trident and Hades' helm of darkness. 
Between 429 and 422 BCE, the Spartan misthios Kassandra traveled to the Bay of Nobody and eliminated Steropes, recovering a bow from its body. Although Steropes was also part of the Olympos Project, Kassandra did not retrieve artifact after defeating him.
Personality and traits
Like the other cyclops, Steropes had an almost animal psychology. He was a very aggressive being, intent on destroying any moving thing in sight. His raged attacks made him capable of bringing down even the most competent opponent. 
Equipment and skills
The size of Steropes was two or three times greater than that of a man, his footsteps and blows could make a place tremble, he had such a brute force that he was able to knock down a target with a single blow in a few moments. His attacks of rage made him faster and more durable being almost invincible.