Blood Devil Slayer Magic (RinkakuKagune)

Blood Devil Slayer Magic: Blood Devil Slayer Magic (ブラッドデビルスレイヤーマジック, Buraddo Akuma Tokkō no Mahō) is a Devil Slayer Magic, Lost Magic, and finally, a Caster Magic.

Description
The magic focuses on blood manipulation and nigh-immortality, with this magic the user can crystallize the blood within themselves or others to use as weapons and/or tools, gain complete control over the blood flow of oneself and others, allowing them to enhance their own strength and speed via increased oxygen and nutrient transferral and can release/use blood to attacks of various shapes and/or intensities, either projected, used as a part of melee attacks, etc. However the user must first cut themselves in order to utilize their blood. Blood Devil Slayer Magic is learnt from a Book of Zeref.

Spells

 * Blood Devil's Rage: Issei, after inhaling, releases a large blob of blood from his mouth, directing it towards an area of his choosing. The blood inflicts great damage upon those it contacts, causing everyone unable to resist it to be sent flying away with great force, as well as leaving behind a trail of destruction in its wake, heavily damaging the area it passes through.
 * Blood Devil's Web: Issei creates webs of blood that can entangle and even severely injure the user's opponents.
 * Blood Devil's Dome: Issei creates blood shield that is rounded in shape like a dome and can block multiple attack at once.
 * Blood Devil's Spiral: Issei generates spirals/vortexes composed of blood, the vortex can be projected as a long ranged attack or as a "tornado" of the respective blood for both offensive purposes.
 * Blood Devil's Sphere: Issei can create and/or project balls of blood, which can be thrown or used as a part of melee attacks.
 * Blood Devil's Claws: Issei creates blood blades that can emerge from any part of the body, usually from his forearms and can be used to attack and cut his opponents.
 * Blood Devil's Bombs: Issei generates bombs made of blood that can float freely and be triggered on command, the sheer pressure of the blood is strong enough to black away concrete stone.
 * Blood Devil's Fist: Issei makes blood that covers his fist protecting and enforcing it, and as a result his power and defence are greatly increased.
 * Blood Devil's Rain: Issei can summon a stream of endless blood waves (ranging from thousands to millions), around their target to bombard them from all sides with no hope of escape.