Magic

In Twisted Wonderland, magic (魔法, mahō) is a natural physical phenomenon like gravity that manifests as a type of ambient energy.

Overview
This energy can be manipulated by mages, who are born with the ability to interact with magical energy at the cost of mana by using their imagination to visualize their spells. The stronger a mage's ability to visualize what they want to do, the easier it is to cast spells. Visualization is so important in the use of magic that some mages will write or draw in order to train themselves to better visualize their magic.

Mana is an energy that is used to cast spells. The amount of mana any individual mage has is set from birth and cannot be increased or decreased, but they can make better use of their mana through training. If a mage runs through all their mana, they run the risk of death.

Magical energy can be used for other purposes besides spellcasting. Magic can be used to power technology. For example, Magical Wheels use the rider's magic as fuel. The Ignihyde dorm specializes in technology powered by magic. Some plants need magical energy to grow, whereas other plants are capable of outputting their own magical energy.

Mages cannot use their magic from birth, they develop it later in life. There seems to be an age that is considered normal, as Sebek refers to developing his magic late, whereas Riddle was seen as remarkable for developing his Unique Magic at 10 years old.

Magestones
Magestones are magic gems found in coal mines that are created when regular gemstones soak up magic from the environment. Magestones can also form when magic in the earth or air happens to crystalized. Mages use them to channel their magic and collect blot or to power magical artifacts such as the chandeliers used in Night Raven College. Every student at Night Raven College, with the exception of Grim, is given a magestone attached to a pen that they use to channel magic. Night Raven College's outfits all contain pockets for their students to easily carry their magic pens, except for their ceremonial robes which have a key-shaped carrier for the pens attached to their waist.

Unique Magic
A Unique Magic (ユニーク魔法, Yunīku Mahō) (Signature Spell in EN) is a spell distinctive to the caster. It is developed subconsciously and used on instinct the first time, as seen with Deuce's first time using his unique magic. The name of the spell is also not consciously picked by the caster.

Blot
Blot (ブロット, Burotto) is an ink-like substance created as a byproduct of magic use. The amount of blot created by a spell is influenced by a person's emotions, with negative emotions like anger, fear, and sadness causing more blot to be created. Blot will accumulate inside the caster of a spell unless they use a magestone to collect it. Every person has a natural amount of blot they can tolerate on their own, and this amount generally does not increase or decrease with the amount of mana a user has. Blot naturally fades with rest and self-care. If the amount of blot accumulated inside the caster exceeds their blot tolerance, overblot occurs.

Overblot
Overblot (オーバーブロット, Ōbāburotto) is a negative state that occurs when a mage accumulates more blot than they can tolerate. The blot then manifests as a Phantom representing the negative emotions of the caster. The Phantom will then drain the mage's magic until it "runs out," causing the mage to disappear and leave only the Phantom remaining. In order to end the overblot, the caster must be separated from the Phantom. If the phantom and the mage can be separated, the phantom will disappear, and the excess blot will crystalize.

Overblot can also occur if powerful curses or sealed Phantoms are released.
 * In Episode of Heartslabyul, it was shown that one of the side effects of overblotting is the victim starts leaking black ink from their head as they keep overusing their magic to corrupt them further. The final stage of blotting has the victims undergo a painful transformation once they fully overload their magic.