Threefold Affliction

Threefold Affliction is Yorozu's domain expansion using her Construction.

Description
Expanding this domain creates a mostly blank space, although with several oversized, organic structures floating within it that resemble the disembodied brains and ventral nerve cords of insects. The sure-hit effect of the domain applies to Yorozu's constructed items.

Usage
Near the end of her battle with Sukuna, Yorozu expanded her domain immediately after constructing a True Sphere in order to guarantee the sphere makes contact with the King of Curses. However, Sukuna counters the attack by summoning Mahoraga, which shatters the True Sphere with its Sword of Extermination since it adapted to Yorozu's Construction. The shikigami proceeds to slash Yorozu across the chest, landing a lethal blow and causing her Domain Expansion to collapse.

Trivia

 * The kanji of the domain's name mean "Threefold Affliction" — with shikku referring to the suffering brought on by illness, or simply hardship in life — hence the choice to render the furigana as shikku repeated twice.
 * Given Yorozu's excessive love for Sukuna, it is likely that the domain's name references "lovesickness" in particular. Coincidentally, a song by Japanese VOCALOID producer PinocchioP (sung by Hatsune Miku) is called "Sick Sick Sick" (シックシックシック), topicizing how love can be a sickness.
 * The floaters within Yorozu's domain, resembling the brain and ganglia of insects, likely reference her affinity with said creature, as seen with her Insect Armor.