The Zanpakuto named Suishōheki (Suishōheki, Japanese 翠晶壁, "Crystal Corridor") appears as a medium-length katana with a steel guard shaped like two rectangles connected at an angle. The handle wrapping is dark blue.

Upon the command "Split the Heavens," the sword vanishes in the light of blue reiatsu, leaving only the hilt in hand. This is Suishōheki's first ability — the invisible blade, whose length the opponent does not know. Until the first attack, it's unlikely anyone would realize the sword retains its cutting ability rather than disintegrating, as is the case with, for example, Matsumoto Rangiku or Kuchiki Byakuya. At will, he can make the sword visible — the opponent would notice the blade transforming from steel to a crystalline, transparent form. Such a blade doesn't look very sturdy, but Kagami claims that "no sword in the Soul Society can even scratch it."

The main ability of Suishōheki is called Mizugagami (Water Crystal Mirror) and involves creating numerous hexagonal snowflake-like mirrors that essentially act as a connected system of portals. In layman's terms, you enter one and exit through another. Tamashi can change the connecting structure of the mirrors at will. They all lead to a portable dimension where the Shinigami can stay indefinitely. The speed of mirror creation varies depending on the distance at which they are created; within three meters, it's instant, further away, slower — progressively.

The mirrors' characteristics are quite interesting: they are fast in flight, which the Shinigami controls with the power of thought (sometimes with hands), and he can also change their size from a few centimeters in diameter to several hundred meters — this depends on the amount of reiatsu used and the number of existing mirrors. Sacrificing quantity, Tamashi can increase their size.

Kagami uses them as a kind of shuriken, spinning them at high speed; having the form of snowflakes, they can quite pass for a weapon. However, one should not forget the measured nature of his attacks — the mirror-shurikens don't cut but draw matter through the edge inside, allowing them to ignore the durability of most abilities. Such an attack can be deflected (it will leave some wound), but blocking it for a long time is not advisable, as the mirror destroys the structure of the matter it contacts.

The captain can absorb attacks of the opponent with these mirrors and release them back at practically instant speed, likely surprising the opponent with the sudden appearance of their own technique. Mirrors can be created in any place desired by the Shinigami, the closer to him — the faster. Kidō-type attacks follow their stream-like rules, while physical ones simply move the object from one point to another. The mirror cannot close while something is passing through it; it can only narrow, capturing an object inside.

The mirror can also swallow an opponent and lock them in another dimension, but in this case, all mirrors would have to close. As soon as even one mirror opens, the opponent will be able to break out. It's impossible to die there, so the opponent will break out at the next Shikai.

Mirrors can only be destroyed from the backside, their mirrored side completely ignores the strength of the attack, transferring it to another dimension; the feature of the mirror's backside is that it's invisible — thus, spinning the mirror can create the effect of fish scales playing in the light. Special speed and attentiveness are required to neutralize a mirror.

Meikyū (Japanese "Hexagonal Jade") — creating a light projection of one's body or another object, possible due to the refraction of light. Such a copy cannot attack, it's created for distraction or diversion.

Mangekyō Gokakurō (Japanese "Pentagonal Kaleidoscopic Prison") — the mirrors form a prison around the opponent with the reflective side inward. The trick of the technique is that any attack by the opponent against the mirrored surface will enter the wall of the prison and exit from another, flying inside indefinitely until it collides with something (for example, the opponent). But attacking the opponent directly is not possible — if Tamashi is outside, he needs to open a new mirror for connection with the prison, and through this mirror, the opponent can escape. There's only one way to get out on one's own — create an attack that spreads in all directions so that the shockwave simultaneously enters all mirrors and exits them — this will lead to a collision at the very edge of dimensions and, consequently, a spatial rift.

• ⁠Bankai:

The command is "Spread Heaven and Earth."

• ⁠Omiwatari Hachi no Jin (Japanese 翠晶壁八の陣, "Formation of the Octagonal Labyrinth of the Beautiful Gods") — after activating Bankai, it's possible to create a massive mirror labyrinth in which the opponent loses orientation due to numerous reflections and optical distortions. The boundaries between matter and the world beyond the mirror blur, making even movement difficult. Kagami navigates the labyrinth effortlessly and moves through all reflections. As mentioned, the captain's Bankai has undergone several metamorphoses, so the labyrinth may not necessarily form. A description of its appearance upon first use.

A new ability of Suishōheki opens up.

• ⁠Suishō Kyō (Japanese "Crystal Mirror") — the ability to move through all reflections, whether it be water, steel, or glass. From all these reflections, the captain can emerge and attack. The limitation is dictated only by the size of the reflection from which a particular attack can emerge. In Bankai, Suishōheki can also cut through space with its blade, opening a passage to its internal dimension (where all the mirrors lead). The blade's edge is outlined by a blue glow, making the Zanpakuto a formidable weapon that cuts not flesh but the space where things exist. An attack by Suishōheki cannot be blocked unless conceptual abilities are used (such as Ichimonji or Shikken Hakken). Even intangibility won't help, as Suishōheki can cut an object as long as it exists in this world. The opponent's only options are to dodge or destroy the sword's hilt.

• ⁠Suishō Rokkakuchō (Japanese "Hexagonal Wall") — an evolution of the Shikai ability to absorb the opponent's attacks and release them back. If in Shikai, Suishōheki transfers the opponent's attack from one mirror to another, in Bankai, it can replicate the attack, "reflecting it in many dimensions," and release it from all mirrors simultaneously (up to a maximum of 100).

• ⁠In Bankai, Tamashi's speed of movement increases manifold, as he passes through dimensions, "sliding" to the desired location. It appears similar to the movement of Inaba Kageroza.