His augmentations, coupled with his mastery of hand-to-hand combat made him a formidable opponent.ДЇollowing his military service, Wilson worked for various private military contractors before striking out on his own вЂ“ and allegedly becoming one of the highest paid contract killers in the world, and specialized in high profile assassinations. Though much of the file was redacted, it appeared that Slade was eventually discharged from the military, though the exact circumstances were not specified. The procedures left him with increased mental function, as well as enhanced speed, strength, healing factor and stamina, although the experiment was claimed to be a failure later on. This distinction earned him admittance into a covert program where he was subjected to extensive mental and physical augmentation. Slade was an accomplished member of the special forces and held the rank of Lieutenant Colonel. Deathstroke appeared as a supporting antagonist and one of Black Mask's 8 assassins in Batman: Arkham Origins and a appeared as a Most Wanted antagonist in Batman: Arkham Knight, but after the Arkham Knight became an anti-hero in the end, Deathstroke took over the Militia and was revealed as the tertiary antagonist. After the Arkham Knight was defeated, Deathstroke replaced him and took his place as commander of the Militia and Scarecrow's second-in-command. Following his defeat and incarceration at the hands of Batman, Deathstroke escaped from the maximum security wing of Blackgate Prison and worked as an ally of Scarecrow and the Arkham Knight, serving as an advisor and overseer of their siege of Gotham and campaign to defeat Batman both mentally and physically, unmask him and turn Gotham City into a city of fear, specifically. Deathstroke became a mercenary soon after the experiment and rapidly gained a reputation as one of the world's greatest assassins. Army during the Vietnam War, Slade Wilson was part of an experimental super-soldier program where he gained enhanced strength, agility, healing factor and intelligence.

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