Sōkyoku

Standing dormant, the weapon takes the shape of a huge naginata pinned upright by a bundle of heavy ropes that spear into the ground and lock it in place. To carry out a sentence, the Kidō Corps releases those bindings, sending them snapping loose and hurtling away from the hill. What looks like a mere polearm is in truth a cage: wreathed in fire, the halberd rises toward the condemned and sheds its disguise to reveal Kikōō, a vast, phoenix-like creature of blaze whose name marks it as a firebird sovereign.

Once roused and burning, the entity climbs into the air and levels itself at the prisoner, who is pinned before it by support beams. In this form its combined offense and defense are reckoned equal to a million Zanpakutō, and the moment it drives into its victim that force multiplies tenfold, generating heat fierce enough to burn away the soul itself. In the anime, the Kidō Corps triggers the release through a sequence of hand signs. The device is not indestructible: after Ichigo Kurosaki stunned onlookers by parrying its descent with Zangetsu, an act Suì-Fēng judged flatly impossible, Jūshirō Ukitake and Shunsui Kyōraku shattered it outright using the Shihōin Shield.

The apparatus belongs to Soul Society and is wielded through the Gotei 13, with the Kidō Corps handling its unsealing. Its most infamous deployment was the scheduled execution of Rukia Kuchiki. Sōsuke Aizen exploited the event through a forged letter to Momo Hinamori, pinning a plot to destroy Soul Society on Tōshirō Hitsugaya, when in reality he wanted the flame's intense heat to vaporize Rukia and extract the Hōgyoku hidden inside her. In the game Bleach: Shattered Blade, the halberd's destruction is said to have broken a seal caging the Arrancar Arturo Plateado and scattered the weapon into shards, each capable of boosting the spiritual power of whoever holds it.