Sinestro

Sinestro is a character from Justice League and is a minor antagonist in Knights of the Multiverse Season 2. He was a former member of the Green Lantern Corps and later, he became their greatest enemy, and now works with many other supervillains and criminals in the Secret Society, and was a part of those that joined up with the Glemy Faction in a bid to conquer the known Multiverse.

Pre-Series
Sinestro was once the Green Lantern of Sector 1417, often regarded as the greatest Lantern in the history of the Corps. However, it was soon discovered that he was using his power ring to bring peace to Korugar by installing himself as a dictator. The Guardians of the Universe stripped him of his ring and banished him to Qward, but the Weaponers of Qward gave him a Yellow Power ring that was as every bit as formidable as a Green Lantern's power ring, making him more dangerous than ever and a deadly threat to every Green Lantern in the universe. Swearing a blood oath of revenge and vowing to destroy the Green Lantern Corps, Sinestro began hunting Green Lanterns and collecting their rings. After he had dispatched Abin Sur, but was defeated by his successor, Kyle Rayner, and Superman.

Later, he was recruited into Grodd's Secret Society in a plot to destroy the Justice League, but was defeated once more.

Skills & Powers
Sinestro uses a yellow power ring that give him the same powers and abilities as members of the Green Lantern Corps, such as flight, travelling through space, projecting energy, creating a force field, and generating yellow energy constructs.
 * Power Ring