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Kidō (鬼道, "demon way", or "spirit way" sometimes translated as Demon Arts; Viz "Soul Reaper's powers"; "Spells") is the technique that Shinigami use to focus their Spiritual Energy into a wide variety of magic spells that can serve many purposes, such as defense or combat. According to Sōsuke Aizen, it is one of the four basic Shinigami combat forms.

The Kidō Corps is a branch of Soul Society's military which excels in the mastery of Kidō.

Kidō Mechanics
Each spell is graded on a scale from 1 to 100, the latter being the most powerful and the most difficult to perform. To use Kidō, a Shinigami must recite the specific incantation for the spell, which is often long and requires a few seconds to speak.

This weakness can be negated by Shinigami capable of using Eishōhaki (詠唱破棄, lit. "Incantation Abandonment"), a technique that releases Kidō without a spirit chant. While it decreases the time needed to release the Kidō, it drastically weakens the spell. While anyone well versed in Kidō can use this technique, it is most effective when done by a skilled practitioner, otherwise the spell could utterly fail. The most skilled experts are capable of using this technique to amazing effect.

Another method of circumventing the necessity, of uttering an incantation for a Kidō, is something called Kōjutsu Eishō (後述詠唱, lit. "Later Mention Incantation"), where the incantation is recited after initiating the spell to power it up. So far, only Hachigen Ushōda has been seen using this technique, in order to reinforce the nature of his Ryūbi Jōmon during his fight against Baraggan Luisenbarn.

The power of a spell relies on the power of the user, as even a low-level spell can be utterly devastating when utilized by a high-class Shinigami.

Kidō can also be used for practical purposes as well. Renji Abarai has demonstrated that a kidō spell can be used to light a dark hallway if the spell is tweaked in the right way.

Kidō Types
There are two main types of Kidō: binding spells and destruction spells.
 * Bakudō (縛道, lit. "Way of Binding"): These are a broad category of defensive spells which blocks/repels attacks or freezes enemies in place. Some of these spells can also be used for healing purposes. This class of spells includes a wide range of Kidō barriers and seals.
 * Hadō (破道, lit. "Way of Destruction"): These are offensive spells which harm an enemy or cause damage to objects. As written above, even the easiest spell can cause enormous destruction and Renji Abarai has used a destructive spell to light a dark hallway.

Kidō Combat
Though Kidō is commonly used by Shinigami in combat, it has several weaknesses that make it difficult to use for that purpose. All of the spells have fairly long incantations and require concentration; because of this, the person using the Kidō leaves themselves open to attack during the duration of the incantation.

In addition, if an opponent is familiar with Kidō, there is the possibility of them identifying the spell by its incantation before it can even be used. However, highly skilled Kidō users can use various techniques to counter these weaknesses, such as Eishōhaki, Kōjutsu Eishō and Nijū Eishō (二重詠唱, lit. "Double Incantation"), which involves mixing the incantations of two or more Kidō spells together to save time and confuse ones' opponent.

A rarer use of Kidō is mixing various spells (such as Bakudō and Hadō together) for unique effects, which is the mark of a skilled user.

Kidō is commonly seen used in instances of surprise attacks, rather then all-out assaults, being most effective when one's opponent doesn't see it coming. Kidō is also usable with just the spell name and no incantation or spell number.