Superman: Action Comics Vol. 3: Men of Steel (Rebirth)

"Lex Luthor is under attack--and only Superman can save him. When the world's most ingenious scientific mind took on the mantle of Metropolis' new Man of Steel, the world took notice--and so did the mysterious Godslayer. But are the Godslayer's actions justified? Will stopping Lex Luthor prevent catastrophe later?"--