Ninjitsu is one of the powersets. It is a Scrapper and Sentinel secondary Power set in City of Heroes and a Stalker secondary power set in City of Villains.
Ninjitsu is the secret art of Ninja. Many Ninjitsu powers emphasize acute senses that allow you to react deftly to avoid danger. Others focus on the ability to hide in plain sight. Still others rely on the ancient art of Kuji Kiri, and the pure focus of the mind to accomplish the impossible.
You throw a handful of Blinding powder in a wide arc at your foes. Most foes will be blinded, and unable to see. Some affected targets may be overcome by the powder that they may start attacking their own allies. If you attack the blinded foes, they will be alerted to your presence, but will continue to suffer a penalty to accuracy.
The Sleep, Perception and Accuracy debuffs are applied to any target the power hits on the initial to-hit roll. On a successful hit, there is a subsequent 50% chance of the Confusion effect being applied.
Bo Ryaku is one of the 18 fundamental skills of the Togakure-ryu school of ninjitsu. Alongside more orthodox and mainstream measures, Bo Ryaku includes use of unorthodox strategies and tactics that help you minimize the amount of damage taken in combat. This power is always on and costs no endurance.
Auto: Self +Resistance(Knockback, Knockup, All Damage)
You toss a handful of Caltrops at a targeted location and spread the tiny metal spikes over a large area. Any enemy that passes over the Caltrops will be forced to move at a slower rate. They will also take some trivial lethal damage over time.
You become more evasive against ranged and area attacks while you have Danger Sense activated. This will increase your defense versus ranged and area of effect attacks as long as it is active. Your Danger Sense also allow you to perceive stealthy foes and resist defense debuffs.
Hide makes you almost impossible to detect. When properly 'Hidden', a Stalker can pull off critical hits with his attacks, and even land a massive 'Assassins Strike' with an Assassins power. When you attack or are damaged while using this power, you will be discovered. Even if discovered, you are hard to see and retain some bonus to defense. Unlike most stealth powers, Hide can be used at the same time as other concealment powers, giving you even greater stealth capability. Very low Endurance cost.
Kuji-In Retsu is the mastery of space and time. Focusing your power on Retsu enables you to control your own time to easily defeat your foes. Mastery of this power enables you to avoid almost any attack, be it ranged, melee, or area effect. Your running speed, jumping height and endurance recovery are also increased. Retsu also grants you high resistance to defense debuffs. When Retsu wears off, you are left drained of all endurance and unable to recover endurance for a while.
Kuji-In Rin is the strength of mind and body. By focusing your power on this exercise, you gain a resistance to disorient, hold, sleep, immobilization, confusion, and fear, as well as resistance to psionic damage for a few minutes.
Activating your Ninja Reflexes enables you to be more evasive to melee attacks. This will increase your defense versus melee as long as it is active. Ninja Reflexes also grants you resistance to defense debuffs.
Shinobi-Iri are the ninjitsu techniques of silent movement and infiltration. These skills allow you to move at high speed, whether on the ground or leaping from rooftop to rooftop. This power also grants you defense against all positional attacks. This power can't be used at the same time as other leaping powers like Combat Jump, or running powers like Super Speed.
You throw a smoke bomb at your feet. The resulting flash of light and smoke can briefly distract your foes and placate them so they can no longer find or target you. Combined with hide, Smoke Flash is the perfect distraction to get out of a bad situation.