Deathstroke

Deathstroke, or commonly referred to as Deathstroke the Terminator or simply Slade, is known to be the greatest assassin in all of DC Comics.

Character History
Slade Wilson was sixteen years old when he first enlisted in the United States Army, after faking his age. After serving a stint in Korea, he was later assigned to Camp Washington where he had been promoted to the rank of Major. In the early 1960s, he met Captain Adeline Kane who was tasked with training young soldiers in new fighting techniques in anticipation of brewing troubles taking place in Vietnam. Kane was amazed at how skilled Slade was and how quickly he adapted to modern conventions of warfare. She immediately fell in love with him, and realized that he was without a doubt the most able-bodied combatant she had ever encountered. She offered to privately train Slade in guerrilla warfare. In less than a year, Slade mastered every fighting form presented to him and was soon promoted to the rank of Lieutenant Colonel. Six months later, Adeline and he were married and she became pregnant with their first child. It was at this time that the war in Vietnam began to escalate and Slade was shipped overseas. At home, Adeline gave birth to their son Grant.

Some time later, Wilson volunteered for a medical experiment designed to stimulate his adrenal gland in the hopes of increasing a soldier's ability to resist truth serums. The experiment did not go as expected, and Slade fell into a coma. When he awakened however, he discovered that was now capable of using 90% of his brain capacity, and his strength, durability and agility were increased to near superhuman levels. He applied for re-assignment with the army, but they refused him. Although his condition was now stabilized, depression took hold of him and he was desperate to serve his country. At this time, Adeline became pregnant with their second child, Joseph. Unable to further his career in the military, Slade turned towards hunting. He became a world famous safari hunter and great wealth followed soon after. Adeline always suspected however that Slade felt unfulfilled.

A few years later, a group of hired mercenaries broke into the Wilsons' mansion and kidnapped young Joey. Adeline attempted to fight them off, but a gas grenade prevented her from saving her son. When Slade discovered what had happened, he knew he could not keep the truth from his wife any longer. Slade was not only a world famous safari hunter, he was also one of the world's deadliest and most highly sought after assassins - Deathstroke the Terminator. He promised Adeline that he would save their son. Together, they flew to Tangiers and squared off against a rival mercenary known as the Jackal. The Jackal wanted Slade to reveal important information relating to a client or else he would have his men kill Joey. Slade gambled on the idea that he could save his son before the Jackal could give the order. Unfortunately, Joseph's throat was slashed by one of the criminals before Slade could prevent it, destroying his vocal cords and rendering him mute. After taking Joseph to the hospital, Slade's wife, enraged at his endangerment of her son, tried to kill Slade by shooting him, but only managed to destroy his right eye. Afterward, his confidence in his physical abilities was such that he made no secret of his impaired vision, marked by his mask which has a black featureless half covering his lost eye.

Deathstroke was a founding member of Lex Luthor's Secret Society of Super Villains. He was seen hiding in a warehouse south of Metropolis waiting to ambush the Freedom Fighters with several other members. The battle didn't last long, and by the end, Deathstroke had impaled Phantom Lady through the chest, calling his action "just business".

He was the employer of an undercover Dick Grayson, 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 when Slade, under the orders of Alexander Luthor, Jr., the real leader of the Society, went with several villains- who included 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 thousands. Slade gave the explanation to the Brotherhood that Nightwing should be made to believe that he can never go home again.

Grayson took the first of his revenge by bursting in on Deathstroke and Rose's training session, revealing to the latter that the Kryptonite that Deathstroke had implanted in place of her missing eye was radioactive and deadly to humans as well as to Kryptonians (though slower in its effects on humans, as revealed by Lex Luthor's old possession of a Kryptonite ring that forced him to transfer his brain to a cloned body). Angered, Slade went after Nightwing with a grenade, only to have Rose try to stop him. Amid the smoke of the resulting explosion, Rose fled, telling her father that she hated him. Dick disappeared as well, but not before leaving a note for Slade warning him that he'd be back to make him pay for Blüdhaven.

At the climactic Battle of Metropolis at the conclusion of Infinite Crisis, Slade was confronted by Batman, Robin, and Nightwing. During the struggle, he was questioned regarding his motives for aiding the Secret Society. His claims of monetary motivation were deemed unsatisfactory, and he was told to take responsibility before being rendered unconscious. He was taken to prison and sentenced to life.

Powers and Abilities
Deathstroke has no real powers, but is an expert marksman and assassin, and known to be the greatest assassin in history.