Royal Crown:
As the king of Atlantis, Orm possesses a magical helm that doubled as a symbol of his royal authority. The Royal Crown gives Ocean Master power over the seven seas themselves. Able to telekinetically bend water at his will.
He soon learned he had an older brother on the surface world, Arthur, who was a child of his mothers. However, He was raised to believed that the people of the surface were cancerous and not to be interacted with.
Superhuman Durability: Deathstroke is capable of withstanding high amounts of physical damage. He is able to withstand hits from the vastly strong Wonder Woman
Decelerated Aging: Deathstroke's healing ability also supplies him with a nearly-ageless lifespan. Due to this ability, Slade is 57 years old, but appears 35
After Team 7 was terminated, Slade began to operate under the Deathstroke identity as a mercenary for hire, eventually becoming known as the world's greatest and deadliest assassin.
Origin:
When Slade was seventeen, he joined the US Army and proved to be an exceptional soldier. After this, Slade was selected for the covert-operations unit, Team 7
