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Nekron
Black Lantern Kal-L
Black Lantern Anti-Monitor
Mephisto (Marvel)
Daimon Hellstrom
Zom
Dormammu

vs

7,200 GLs
All Guardians
Sodam Yat Ion

It was pretty clear in Blackest Night that the Green Lanterns couldn't bring down Nekron with only one spectrum color.