Ninja Art: Shadow Warrior

"In smoke, the warrior becomes shadow; unseen, untouchable, and ever-watchful in the darkness."

Description:
Shadow Warrior is a feared ninja art shrouded in mystery, taught only to those who have mastered the art of stealth and self-control. By channeling their spirit into a wraith-like state, the user transforms into an intangible smoke form, able to slip through cracks and evade harm. This form is the ultimate escape and infiltration tool, though it comes at great risk; those who lose control of the form or remain in it for too long may find themselves lost in the ether forever.

Ability Mechanics:

• Transformation: Upon activation, your body dissolves into black smoke, dark and swirling with hints of shadow. You become intangible, able to drift in any direction as long as you have a bonus action available to move.
• Usage: You can enter this smoke form 1 + your proficiency bonus times per long rest, reflecting your growing mastery over the art as you progress.
• Duration: You can remain in smoke form for up to 1 minute each time you use this ability. While in smoke form, you can fit through small cracks, keyholes, and even slits in walls, though emerging from form within such a space is fatal.
• Damage Immunity: While in smoke form, you are immune to all non-magical damage, though magical damage can still harm you, including area effects like fireball or magic missile.
• Restrictions: While in smoke form, you cannot interact physically with the world, preventing you from attacking, carrying objects, or casting spells.
• Fatality Risk: If you attempt to exit smoke form while within a small or confined space (such as a crack, keyhole, or other tight passage), your body is crushed by the immediate physical constraints, resulting in instant death.

Visual & Sensory Effects:

• Appearance: Upon transformation, your form becomes a swirling, pitch-black smoke that moves with a will of its own, faintly illuminated by eerie glimmers resembling dying embers within the shadowy cloud.
• Sound: The transformation is silent, though those who watch might hear a faint, ominous whisper as you move, almost like a breeze carrying distant voices.
• Feel: The air around your smoke form is cold, leaving those nearby with an unsettling chill as if touched by something not entirely from this realm. Those who attempt to touch your smoke form feel only a strange, cold mist slipping through their fingers.

Lore:
The origin of the Shadow Warrior art is woven with dark tales and whispered myths. It is said to have been discovered by a renegade ninja who communed with spirits from the Shadow Realm, bartering pieces of his own humanity in exchange for the power to become as smoke and shadow. Those who practice this art are both respected and feared, for the technique is notorious for taking lives as easily as it grants freedom.

Some clans see it as a mark of a true ninja, one who has transcended the physical plane, while others warn that prolonged use may lead to a loss of self, where the user risks becoming part of the shadows forever. In training, practitioners are told never to exit this form in confined spaces or unfamiliar areas, as countless ninjas have vanished—becoming whispers in the wind, forever lost to the shadows.