Fracta (LoDs)

The Fracta were smaller and less powerful versions of the Hōgyoku which were considered to be Prototypes of the mighty stone, the Fracta were designed apparently from a pair of Stones that had been blessed by Kidō capable of altering the very nature of the Soul King's Kingdom which the responsible Kidō may have been cast by the Soul King himself, they have apparently been placed into limit production and put into worthy hosts by former 5th Division Captain Sōsuke Aizen, the first two being the former Quincy and Vasto Lorde twins Shi Yomi and Neru Yomi.

Trivia

 * Fracta is a Latin word, one of many, meaning "Shattering". Possibly in regard to "fracturing".