Beast Beneath the Moonlight

Beast Beneath the Moonlight (月下獣, ekka-jū) is the ability of Atsushi Nakajima.

Description
The ability transforms Atsushi into a weretiger. The ability makes Atsushi to have:
 * Full Body to Partial Transformation: Atsushi has shown several varying states of transformation, which range from a rather large full tiger form, to just slit pupils and tiger stripes on his face. He can transform and manifest various tiger body parts at wills, such as tiger forearms with claws, or a tiger tail.


 * Regeneration: Also notable is that Atsushi's ability has extreme regenerative powers capable of healing bisection and amputation almost instantly. This was shown during his fight with Akutagawa.


 * Increased speed and stamina: He has shown to possess immense speed, durability, strength, stamina, and endurance on several occasions. He has also been shown to be a natural fighter in close combat and has shown to very cunning in battle in several fights. However, after using his ability, Atsushi seems to become unconscious and collapses onto the ground.
 * Enhanced senses: Due to the tiger's nature, Atsushi can hear and see above what is normal for humans.

Types

 * Beast Beneath the Moonlight Rashomon (月下獣 羅生門, Gekka-jū Rashōmon): Atsushi is wrapped by Rashomon, able to cut through space and having bigger claws to attack.

Derivation
Beast Beneath the Moonlight is based on real-life Atsushi Nakajima's book, titled "Moon ", a collection of nine short stories.