Kidō

is one of the four basic Shinigami combat forms, at least according to Captain Sōsuke Aizen.

Kidō is the technique that Shinigami use to focus their magical power into spells of various powers. These spells serve a wide variety of uses such as healing, defense, or combat.

These spells are graded on a scale of 1 to 99, the latter being the most powerful and the most difficult to perform. In order to use kidō one must say the incantation and state the name of the spell and it's number. For someone skilled enough in kidō, the incantation is not necessary. There are two main types of kido: binding art and destruction art. Binding art can be used to heal, defend, or restrain whereas destruction art is used to inflict damage.

Binding(縛道, bakudō, literally "way of binding") Spells
1. — Locks a target's arms in place behind their back. Incantation: unknown/none.

4. — An energy rope entangles a target's arms. Incantation: unknown/none.

9. — Engulfs a target in red light, completely paralyzing them. Incantation: "Disintegrate, you black dog of Rondanini! Look upon yourself with horror and then claw out your own throat!"

39. — Summons a shield of condensed reiatsu to block opponents' attacks. Incantation: unknown/none.

58. — Tracks and locates any spiritual force the user focuses on. To activate it, the user must draw a circle on the ground, cut into four parts with a specific character in each. The incantation animates the circle, causing various numbers to appear within until the specific set is found. The number set seems to be a variation on longitude and latitude. Incantation: "Heart of the south, eye of the north, finger of the west, foot of the east, arrive with the wind and depart with the rain."

61. — Summons six thin, but wide, beams of light that slam into a target's midsection, holding them in place. Incantation: "Carriage of Thunder. Bridge of a spinning wheel. With light, divide this into six!"

62. — A rod formed of energy is thrown towards the target before it disintegrates into numerous short rods which are used to pin the target to the surroundings and render them immobile. Incantation: unknown/none.

63. — Binds the arms of a target. According to Hachigen Ushōda, physical strength alone should not be enough to brake level 60 Bakudō, however Kensei Muguruma was able to free himself from this kidō while in his hollow form. Incantation: unknown/none.

75. — Summons five incredibly tall and thick pillars to pin a target to the ground. Incantation: "Walls of ironsand, a priestly pagoda, glowing ironclad fireflies. Standing upright, silent to the end."

77. — Transmits messages to anyone within Soul Society. In addition to reciting the spell, the user must draw specific markings on their arms, which are animated by the spell to convey the messages. Incantation: "Black and white net. Twenty-two bridges, sixty-six crowns and belts.  Footprints, distant thunder, sharp peak, engulfing land, hidden in the night, sea of clouds, blue line.  Form a circle and fly though the heavens."

81. — Creates an energy barrier in the form of a rectangular wall. According to Byakuya, it is capable of stopping destructive spells up to #89. However, it is also said to be forbidden by Tessai the former kido captain. Incantation: unknown/none.

99, Part 1. — Binds the arms of a target with spiritual fabric and iron shafts. Incantation: unknown/none.

99, Part 2. — This spell covers a target from head to toe with spiritual fabric (first song), stabs them with numerous metal blades (second song), and then smashes them with an immense metal cube (final song). Incantation: "First song: Halting Fabric. Second song: hundred linked bolts. Final song: Great seal of 10,000 forbiddings."

Destructive (破道, hadō, literally "way of destruction") Spells
1. — Pushes the target away from the caster. Incantation: unknown/none.

4. — Fires a concentrated bolt of lightning from the caster's forefinger. Incantation: unknown/none.

31. — Fires a ball of red energy at a target. Incantation: "Ye lord! Mask of blood and flesh, all creation, flutter of wings, ye who bares the name of Man!  Inferno and pandemonium, the sea barrier surges, march on to the south!"

33. — Fires a burst of blue spiritual energy at a target in a similar manner to 31, but over a wider area and with more power. Incantation: "Ye lord! Mask of flesh and bone, flutter of wings, ye who bares the name of Man! Truth and temperance, upon this sinless wall of dreams unleash but slightly the wrath of your claws."

54. — Fires a blast of purple spiritual energy that will incinerate a target completely when it makes contact. Incantation: unknown/none.

58. - A widening tornado-like blast is fired towards the target. ncantation: unknown/none

63. — Fires a massive wave of yellow energy at a target. Incantation: "Sprinkled on the bones of the beast! Sharp tower, red crystal, steel ring. Move and become the wind, stop and become the calm.  The sound of warring spears fills the empty castle!"

73. — Essentially a doubled version of #33, this spell fires two shots of blue fire with greater potency than the single-shot variety. Incantation: "Ye lord! Mask of blood and flesh, all creation, flutter of wings, ye who bares the name of Man!  On the wall of blue flame, inscribe a twin lotus. In the abyss of conflagration, wait at the far heavens."

88. — Fires a gigantic blast of spiritual energy resulting in a truly enormous explosion. Incantation: unknown/none.

90. — Forms a box of black energy around a target, which is then pierced by dozens of energy "spears", lacerating the one inside from head to toe. Its appearance and function is reminiscent of a common magician's trick, as well as certain torture devices used during the Spanish Inquisition. Incantation: unknown/none.

Forbidden Kido

 * — A forbidden spell used by Tessai along with kūkanten'i. It is a spell that halts time in a specific area.


 * — A forbidden spell used by Tessai with jikanteishi to teleport a specified portion of space from one point to another, transporting even other active kidō spells.

Bakudo

88. - a forbidden spell that erects a barrier seemingly of some form of crystal. It is capable of stopping level 88 destructive kido spell.

Other
These spells are not explicitly stated to be in one category or the other.


 * — Momo Hinamori uses this spell while imprisoned to knock out a guard and destroy everything within a certain radius of herself. The anime suggests that it is a binding spell, but doesn't number it.


 * — Tōshirō Hitsugaya used this to seal Momo Hinamori's hospital room. It creates a glass-like barrier which is difficult to break from the outside, but quite simple to break from the inside.


 * — This technique nullifies an opponent's kidō by hitting them with a perfectly opposite surge of energy. Yoruichi uses this against Soifon's shunkō.


 * — As the name suggests, the Kidō Cannon is basically a high-intensity energy weapon powered by kidō in Bleach: Memories of Nobody. It consists of a crystalline focus point attached to the top of a massive pole, with several smaller crystal structures circling up towards the main one. It is powered by hundreds of shinigami working in concert, creating an energy blast capable of obliterating a small dimension. The blast forms into several animal shapes which roar just before contact. The power of the blast is such that, in addition to destroying its target, it also causes a small amount of damage to both the human world and Soul Society. Despite its power, it is not a reusable weapon, as it burns into a pile of scrap after being fired.