It is unknown when Sukuna was able to develop his Domain Expansion, but he was able to use it even after his incarnation.
The environment of Sukuna's Domain Expansion takes the form of a Buddhist shrine that has been disfigured to enshrine a demon such as Sukuna himself. The shrine has horns on the roof, skulls hanging at each of the corners of the roof, mouths coming out of each side of it, and is surrounded with bull-shaped skulls.
Malevolent Shrine is different from other types of Domain Expansions, in that it doesn't create a separate space within a barrier. Instead, Sukuna can directly manifests it onto reality while able to have sure-hit effect without requiring a barrier. Because of this, it is considered a truly divine technique, as the ability to realize one's innate domain without using a barrier is akin to an artist drawing on thin air instead of a canvas.
By allowing an escape route due to the absence of a barrier, A Binding Vow is created which increases the domain's effective area with a maximum radius of nearly 200 meters. The radius can be narrowed down if desired.
Within Malevolent Shrine, Sukuna is able to utilize Cleave and Dismantle to relentlessly cut anything in its radius. Dismantle targets inanimate objects, while Cleave targets anything with cursed energy.
Sukuna first used it to effortlessly defeat the Finger Bearer. When utilized in Shibuya, Sukuna used it to overwhelm Mahoraga, destroying everything caught within its 140 meter radius in the process.
- Regarding the name of this Domain Expansion:
- The first part, fukuma (伏魔?), comes from fukumaden (伏魔殿?), referring to an abode of demons/a palace where demons lurk, and is also translatable as pandemonium.
- The second part, mizushi (御厨子?), could have several meanings:
- Disregarding the honorific prefix mi- (御?), a zushi (厨子?) is a miniature Buddhist shrine with double doors, similar to a feretory, that is used to store important Buddhist items like statues, śarīra, sutras, mortuary tablets, and so on.
- The mizushi-dokoro (御厨子所?) is an archaic word referring to a section of the Emperor's residential compound in the Imperial Palace, where food from the kitchen compound, meant for the Emperor's meals, would be brought for more advanced stages of preparation.
- The second character zu/kuriya (厨?) means "kitchen".