You gain the power of Haki from One Piece, in all of its variations.
Armament Haki covers all or part of your body in a black coating, enhancing your strength and durability, and allowing you to injure beings whose powers would usually make them immune, such as those who are intangible or have a body of living fire.
Observer's Haki is a sensory power, which gives its user the ability to sense the aura and emotions of others in range, and with practice confers a type of combat precognition.
Conqueror's Haki creates a sort of 'pressure' that can knock out the weak willed, or temporarily force fear or compliance on those who fail to resist. In extremes it can damage physical objects.
Unlike most powers, Haki relies heavily on the determination and willpower of its user, and falters when they do.