He was the employer of Nightwing, whom he hired to train his daughter Rose. However, after the two had a confrontation with Superman, Deathstroke discovered that Nightwing had been teaching Rose the values of heroism. He could not kill Grayson in front of his daughter, because doing so would undo all of Slade's teachings. Nightwing offered a deal: he would stay away from Rose if Slade would keep the metahuman villains out of Blüdhaven. The deal held for 34 hours until "Infinite Crisis" #4, when Slade, under the orders of Alexander Luthor, Jr., the "real" leader of the Society, went with several villains (including old Titans and Doom Patrol foes and Brotherhood of Evil members Monsieur Mallah and Brain) to drop Chemo, another fellow villain who appeared to be a nearly brainless monster made of pure energy and radioactive chemicals, on Blüdhaven, killing over 100,000 people. Slade gave the explanation to the Brotherhood that Nightwing should be made to believe that he can never go home again.