Saviors who are able to use Black Magic has mana, the power source required to cast Dark Arts. In the midst of casting a spell, a Kuroma absorbs the natural powers from their surroundings to increase their mana to cast the chosen spell; then the spell is then written in midair before the caster. All Dark Arts are split into different groups and strengths based on the number of lines that the spell in question as such as the "Step One Dark Arts: White Breath" has one line and "Step Three Dark Arts: Frozen Shade" has three lines.
Dark Arts are more based on causing destruction and have little spells, which deal with healing wounds, unlike a Shirogane. However, due to the natural opposition between both mana and prana, if a Kuroma injects their mana into a Shirogane, then their prana would react to the "invasion" and cause the prana of a Shirogane would activate their recuperative powers.
There are two individuals who're able to use powerful Dark Magics and incantations, which has enough power to be able to cause enough destruction to force maps to be redrawn referred to as "Grimoire Holders". Two of these spells are Step Thirteen Dark Arts: Celestial Crusaders and Ouroboros
Dark Arts can also be used to enchant their or someone else's weapon as shown in the anime as Shizuno used "Freezing Shade" to enchant Satsuki's Arciel to release a freezing slash.
Flare (火炎,Kaen, lit. "Flame"): This is a Step One Dark Art.
Blaze (猛火,Mōka, lit. "Raging Fire"): This is a Step Two Dark Art.
Incinerate (火葬,Kasō, lit. "Cremation"): This is a Step Three Dark Art.
Blaze Storm (炎の大嵐,Honō no Ōarashi, lit. "Great Storm of Fire"): This is a Step Four Dark Art.
Black Gehenna (黒縄地獄,Kokujō Jigoku, lit. "Black Rope Hell"): This is a Step Five Dark Art.
Pyroclasm (紅蓮地獄,Guren Jigoku, lit. "Crimson Hell"): This is a Step Six Dark Art.
Inferno (大焦熱地獄,Daishōnetsu Jigoku, lit. "Great Heat Hell"): This is a Step Seven Dark Art.
The Abyss (天地終焉の劫火、無間地獄,Tenchi Shūen no Gōka, Mukenjigoku, lit. "Conflagration of the End of Heaven and Earth, Infinite Hell"): This is a Step Thirteen Dark Art.
White Breath (氷の吐息,Kōri no Toiki, lit. "Ice Sigh"): Step One
Freezing Shade (凍てつく影,Itetsukukage, lit. ""): Step Three
Dreadful Blizzard (凄まじき吹雪,Susamajiki Fubuki, lit. ""): Step Four
Blizzard Specter (吹雪の死霊,Fubuki no Shiryō, lit. ""): Step Five
Bright White Frost (氷結地獄,Hyōketsu Jigoku, lit. ""): Step Six
Jötunheimr (氷の牢獄,Kōri no Rōgoku, lit. ""): Step Seven
Frost Giant (霜の巨人,Shimo no Kyojin, lit. ""): Step Eight
Frost Wyrm (霧氷鱗の魔竜,Muhyō Uroko no Maryū, lit. ""): Step Nine
Cocytus (摩訶鉢特摩地獄,Maka Hachi Toku ma Jigoku, lit. ""): Step Thirteen
Hydro Blast (水流破,Suiryūha, lit. ""): Step One
Hydro Serpent (流水の海蛇,Ryūsui no Umihebi, lit. ""): Step Five
Ouroboros (世界喰らいの蛇,Sekai Kurai no Hebi, lit. ""): Step Thirteen
Lightning (稲妻,Inazuma, lit. "Lightning"): Step One
Four-Way Lighting (四筋の稲妻,Shi Suji no Inazuma, lit. "Four Lightning Bolts"): Step Two
Blitz Ball (狂乱する球雷,Kyōran Suru Kyū Kaminari, lit. "Furious Ball Lightning"): Step Three
Thunder Spirit (雷雲の精霊,Raiun no Seirei, lit. "Thundercloud Spirit"): Step Five
Thunderstorm Helix (稲妻の螺旋,Inazuma no Rasen, lit. ""): Step Eight
Thunderbolt Dragon (稲妻の魔竜,Inazuma no Maryū, lit. ""): Step Nine
Celestial Crusaders (天界十字軍,Tenkai Jūjigun, lit. "Heavenly Crusader"): Step Thirteen
Breeze Blade (引き裂く突風,Hikisaku Goppū, lit. "Gusts of Tears"): Step One
Breeze Mace (吠えたける強風,Hoe Takeru Kyōfū, lit. "Roaring Strong Wind"): Step Two
Breeze Shamshir (切り裂く風,Kirisaku Kaze, lit. "Wind Breaking"): Step Three
Tempest Gin (嵐の精霊,Arashi no Seirei, lit. "Storm Spirit"): Step Five
Flash (閃光,Senkō, lit. "Flash"): This is a dark art, where the caster releases a blinding light for an instant.
Mind Swords (精神の剣,Seishin no Ken, lit. "Spirit Sword"): This is a dark art, where the caster summons swords to attack mind of one's enemies.
Mind Thrust (精神の槍,Seishin no Yari, lit. "Spirit Spear"): This is a dark that, where the creates a force that targets ones' spiritual strength. In the anime, it took form as a tornado.
Bind (束縛,Sokubaku, lit. "Restraint"): This is a dark art, which binds one's opponent in chains.
Spirit Strings (魂の紐,Tamashī no Himo, lit. "Soul String"): A dark art, where the caster creates half-transparent strings, although it isn't as durable as «Bind», it has characteristics that make them last longer and extends as far as required. Based on the user, it can last for almost an hour without disappearing.
Sleep Near Death (万の眠り,Man'nonemuri, lit. "Sleep Everywhere"): This is a dark art, where the caster puts their target into a deep sleep. Morohha used this against Elena Arshavina.
Hex (護法印,Gohō Shirushi, lit. "Protection Law Seal"): This is a dark art, where the caster uses a basic defensive spell. Although it is useful to the caster, it has low power and it doesn't have much defensive power against different attributes, Hex won't have many effects if used wrongly.
Blue Hex (青の護法印,Ao no Gohō Shirushi, lit. "Blue Guardian Seal"): This is a defensive dark art, where the caster creates blue barriers all around themselves and others. Blue Hex is most effective against wind and water attributes, as such, it doesn't work against flames.
Red Hex (赤の護法印,Aka no Gohō Shirushi, lit. "Red Guardian Seal"): This is a defensive dark art, where the caster creates red barriers all around themselves and others. Red Hex is most effective against fire and lightning, but can't defend against physical attacks or other kinds of attributes.
Eija Grid (上天の障壁,Jōten no Shōheki, lit. "Heavenly Barrier"): This is a high-level defensive dark art, where the user creates a wall against every form of element in the skies. Eija Grid can't be used by people below B or A rank.
Healing (傷跡の治療,Kizuato no Chiryō, lit. "Scar Treatment"): This is a supportive dark art, where the user heals a target by writing magic runes on their skin. In anime, it has been replaced by healing by touching with a hand.
Decrease Weight (羽毫の体現,Hanegō no Taigen, lit. "Embrace of the Feater Writing"): This is a Dark Art, where the caster decreases their weight to near zero and allows them to fly/float.
Phantasmal Vision (幻影の像,Gen'ei no Zō, lit. "Illusion Image"): This is a dark art, where the caster creates an optical illusion i.e. clones of themselves. The illusions are made by one's image, so if it's strong then one can create any kind of illusion.
Magiscope (遥か見,Harukami, lit. "Far View"): This is a dark art, where the caster increases ones' vision, making them being able to see from far away distances. Magiscope is the same as «Tengentsu». For those with higher mana, the caster can see up to one kilometers ahead, while S Ranks can easily see up to five or more easily.
Suppression Field (抑制の場,Yokusei no Ba, lit. "Place of Restraint"): This is a defensive dark art, where the caster creates a barrier able to weak beings who don't have a soul such as the lightning beasts of Vasilisa.
Moonlight Javelin (月銀の槍,Tsuki Gin no Yari, lit. "Moon Silver Spear"): This is a dark art, where the caster shoots a spear that shines like moonlight toward their target. Although it has great flight distance, its accuracy isn't as high.
In the anime, the Kuroma writes and chants faster than humanly possible, and when the chant is finished, it hangs in front of them in ethereal letters, which he/she flicks with their finger before proclaiming the name of the move before launching it.