The Madness of the Jewel King (宝石王の乱心, Hōseki-ō no Ranshin?) is the ability of Ace.[1]


Karma equipped with Ace's collar.

The Madness of the Jewel King allows Ace to change the lifespan of his subordinates into jewels of a similar value. In particular, he provides his men with a special collar with a jewel in it, which cannot be equipped without their own discretion. Upon wearing it on the neck, the collar cannot ever be taken off again. When Ace activates his ability on his target, the jewel on the person's collar illuminates as they eventually dies. Afterwards, jewels of a proportionate "value" to the victim's lifespan will materialize on his palm.[1]


Manga Appearances
Chapters in which the ability appeared/used
Anime Appearances
Episodes in which the ability appeared/used


The ability is a reference to The Madness of George III, a play by Alan Bennett in 1991. It depicts the life of King George III of United Kingdom and his battle with his mental illness.[2]


  1. 1.0 1.1 Bungo Stray Dogs Manga and Anime: Chapter 42 and Episode 29.
  2. The Madness of George III. Wikipedia.

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