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Green Guardsman

Post-Crisis

Green Guardsman's powers and abilities

Powers were similar to the Justice League's Green Lantern(of the 2000s JL animated series). He was able to fight John to a draw for a short time. A winner was not determined, so they might have fought on until the rings' energy ran out. John was able to stop a run-away train(under a little strain), so that gives you some idea.