Hadō #90. Kurohitsugi (黒棺, Black Coffin) is a Kidō spell.
Kurohitsugi is a high-level Kidō which seals its target in a black spiritual coffin. The practitioner generates purple/black spiritual energy, which envelops the target with a powerful torrent of gravity before taking the form of a box of black energy, covered in several spear-like protrusions which pierce the box, lacerating the one inside from head to toe. The spell is very difficult to use, as even Sōsuke Aizen could only unleash a third of its power without chanting the particular incantation when he used it on 7th Division Captain Sajin Komamura.
When Aizen later uses it on Ichigo Kurosaki with the incantation, it is noticeably different in appearance. The sky appears to darken as multiple boxes of black energy appear, each of them topped off with cross-shaped spears, before they multiply and close in on their victim. Aizen claims that, at least with the incantation, it has the power to distort space and time.
"Seeping crest of turbidity. Arrogant vessel of lunacy! Boil forth and deny! Grow numb and flicker! Disrupt sleep! Crawling queen of iron! Eternally self-destructing doll of mud! Unite! Repulse! Fill with soil and know your own powerlessness!"
滲み出す混濁の紋章. 不遜なる狂気の器! 湧き上がり否定し! 痺れ瞬き! 眠りを妨げる! 爬行する鉄の王女! 絶えず自壊する泥の人形! 結合せよ! 反発せよ! 地に満ち己の無力を知れ!
Nijimidasu kondaku no monshō. Fusonnaru kyōki no utsuwa! Wakiagari hiteishi! Shibire matataki! Nemuri wo samatageru! Hakōsuru tetsu no ōjō! Taezu jikaisuru doro no ningyō! Ketsugōseyo! Hanpatsuseyo! Chi ni michi onore no muryoku wo shire!
- Bleach Official Character Book 2 MASKED, page 71
- Bleach manga; Chapter 176, pages 11-12
- Bleach manga; Chapter 418, page 15