10 Most Powerful Green Lanterns
6. Abin Sur
For the longest time, Abin Sur was just what he was in his original appearance: a plot device for Hal's origin story. However, as time went on, readers were slowly fed more information about him from various writers.
It wasn't much, but just from the way other Green Lanterns and other alien races talked about him, it was clear that Hal had inherited the power ring of one of the greatest Lanterns to ever exist.
Why and how Abin Sur was killed varies depending on which era of the DC universe you consult, but no matter what, it was not easy for his assailants. Abin was so overwhelmingly powerful that he created an entire new spectrum of power rings - the Indigo Tribe - without anyone knowing, as a failsafe against the Guardians if they ever went bad, and as an added layer of defense against the fabled Blackest Night Prophecy.
And whenever Abin Sur is given his own story, such as in the anthology movie Green Lantern: Emerald Knights, the man more than lives up to the hype, managing to hold his own against Atrocitus without any ring power.