*Retribution! To atone for Krona's heinous deed, the Oans took the role of Guardians of the Universe and created the Green Lantern Corps, an interstellar police force 3600 strong! Armed with power rings that drew emerald energy from the Guardians' central power battery, the Green Lanterns fought for law and order throughout known space - until the great power battery was destroyed! *Source: Back of Card