Fortuna Ataraxia

Fortuna Ataraxia, also known as The Black Threat Of Unwavering Luck, is the Sacred Gear of the protagonist Kokuto Kurokami from the story Black Blade, Black God of Misfortune. Taking the shape of a black cat known as Tama(たま), this low-tier Sacred Gear has the ability to balance and manipulate reality on a low scale proportionally to Kokuto's own fortune/misfortune ratio.

Profile
The Sacred Gear of the protagonist Kokuto Kurokami, which awakened some time during his early childhood in the shape of a small, cute cat-like being which can be summoned from a single magical string from Kokuto's little finger on his left hand, which was named 'Tama' by Kokuto, a common name for cats.

Being an autonomous Sacred Gear, Fortuna Ataraxia can freely move indepently from Kokuto's will, but rather stays rested around Kokuto either on top of his head or on his left shoulder. Much more like a real cat, the Sacred Gear is lazy and unmotivated, only reacting abruptly when in eminent danger.

Appearance
Fortuna Ataraxia originally took the form of a single black string coming from Kokuto's little finger. As he grew and the Sacred Gear developed, it eventually had enough power to wrap the string around itself and take the shape of a small, cute black cat of black fur, red eyes and a single numeral which changes according to Kokuto's 'luck meter'.

Abilities
An autonomous, situational low-tier Sacred Gear, Fortuna Ataraxia is a Sacred Gear that allows Kokuto to manipulate and even control, to some extend, his own luck, and balance the ratio between luck and misfortune in his life at will. Every time Kokuto desires, Fortuna Ataraxia can grant him a certain amount of luck which extend will shown on the cat's forehead by a certain number. The less the chances of something happening, the bigger the number will be, and vice-versa. This allows Kokuto to manipulate reality to some extend, as shown when he made a flipped coin fall on it's side and struck hit a jackpot on a random slot machine.

The contrary can also happen: When something unfortunate happens to Kokuto by chance, Fortuna Ataraxia can 'save' that amount of bad luck and turn it to Good luck on Kokuto's command, as shown when Kokuto's was assaulted by a serial killer and, in turn, had enough 'luck points' to struck Saji with lightning on a clear sky. By being able to manipulate something as metaphysical as luck, this Sacred Gear is also difficult to detect and tell apart from use, making it easier for the user to utilize it's abilities without being caught.

As the series continues and Kokuto develops more knowledge about the extend of his powers, Fortuna Ataraxia begins to develop new abilities in tier with other fortune telling techniques.

Drawbacks
Fortuna Ataraxia will have to eventually balance the amount of luck that Kokuto can use at the time, and if Kokuto does not empty his stock of bad luck on a time limit, the amount of 'bad luck' points saved in his Sacred Gear will unleash a wave of misfortune on him which can potentionally kill him. Kokuto further exemplifies this by saying that if he uses his Sacred Gear to try to win at the lottery, he could potentionally die from common cold or hit by a random meteoryte.

The Sacred Gear is also useless in events and scenarios in which Kokuto has no chance of winning, as seen when the Sacred Gear was unable to work against the likes of Tobio Ikuse or a high-tier God.