Joan Arc

Joan Arc (ジョーンアーク, Jōn Āku) is one of the Three Knights of Cedar, being the Black Knight (黒騎士, Kuro Kishi), known for being much more brutal than the White Knight, John Deschain, and is also the only Knight from the original Three Knights, before the Whtie Knight was replaced by John and the other went missing.

Equipment
Black Knight Armor: Unlike John's White Knight Armor, which was created by Lamia, Joan's armor is a Magic Item she herself inherited from her father, though it is said to be a forbidden Magic Item due to its power and how it can affect the host, however, Joan claims to have mastered the armor's ferocious power, which is how she became one of Cedar's strongest knights. The armor can be worn by any human being, as the armor can shift into the right size and form for the wearer to be comfortable in, and provides near invulnerability to Joan. The armor grants the wearer great power, yet still suffers from severe weaknesses along with it. Mirukagemonai (見る影もない, Mere Shadow of One's Former Self): Joan's sword, considered a part of the armor itself, it is a pitch black sword, much like her armor, and can be wielded with one hand. Its blade and guard have red markings on it from one side only, and can only be used along by the wearer of the Black Knight Armor, otherwise, Mirukagemonai would make its energy overheat, making it impossible to grab without getting serious burns, unlike the armor that can by anyone, but not controlled by everyone. What makes Mirukagemonai special is the polar opposite of the armor, it has incredible offensive capabilties, being capable of cutting through arguably anything with a single slash, and deflect any and all attacks, however, its weakness is its average durability, as it can be broken much like any other sword, but can be fixed by a skilled blacksmith, albeit not immediately.
 * Power Enhancement: Once Joan wears the armor, in battle, her normal abilities increase immensely, both natural and magical abilities, making her much stronger than before, though this ability can be tapped into through Joan's desire, as over using the armor's enhancement comes with the price of the armor itself becoming less and less durable, which could lead to it crumbling to pieces and perhaps even disappear forever, thus it is only used against powerful opponents.
 * Immense Durability: More of the armor itself, rather than an ability it grants, but the armor itself is incredibly durable, rumored to only break by the power of an army, which is the main advantage it grants Joan, allowing her to rush into battle, even recklessly, and evantually come out unscatched thanks to the armor's durability.
 * Magic Energy Manipulation: While wearing the armor, Joan can freely control her raw magical energy in order to perform different kinds of attacks, technically not classified as "spells", due to them not being used from a source of magic, but rather the magic energy itself. Using this, Joan is capable of creating devastating attacks without using her Magic, but it can be much more costly than when she regulary uses her magic.

Trivia

 * Joan's appearance is based off of Saber Alter from Fate/Stay Night.
 * Joan is named after Joan of Arc.