Slade (known as Deathstroke in the original DC comics) is the Teen Titans most recurring and elusive archenemy, who wants them destroyed for his own unknown reasons.
Primarily, Slade possesses enhanced strength, reflexes and endurance, an accelerated healing factor, and is a skilled fighter in many forms of armed and unarmed combat, putting himself at Robin's level. Slade has been able to hold his own even against superpowered opponents, such as all the members of the Titans. In addition, he is a master of psychological manipulation and a master planner and strategist and has also demonstrated skills in disguise and ritual magic.
As Trigon's lackey, Slade was granted the ability to fly, teleport, phasing, and to generate demonic fire blasts. As an effectively non-living entity at that time, he also possessed no sense of pain and the ability to withstand even massive amounts of physical damage.