Variable Stone

Variable Stones are unique ores found inside of the splintered meteorites that the savage had traveled alongside through space.

Description
Since discovering this new material originating from the meteorite that the savages came with, several scientists started to research the Variable Stone which reacted after coming into contact with humans. It soon led to the creation of the anti-savage weapons, which has soon became known as the Hundred or One-Hundred Arms due to the one-hundred possible weapons that it can form. Charlotte mentioned that several computer-controlled genetic manipulations alongside a process that has all evolved since the Middle Ages.

The Variable Stones has also shown to be useful for various other purposes other than creating Hundreds such as creating the Variable Suit, a unique battle outfit created for Slayers in order to bring out the full abilities of their Hundred and Sense Energy.

The variable stone could also be utilized in order to create automaton life-forms such as Mei Mei who was created by Linis Harvey, as well as the replicants created by Vitaly Tynyanov, and can be used to power the various inventions that Charlotte Dimandias created.

Kenzaki Hokuto, the older brother of Ryusei, both a master swordsmith and a swordsman of Yamato forged two pitch-black katanas using variable stones as raw material, which was able to wound savages to a lesser extent than genuine Hundreds. Though both swords were heavier than a normal sword meaning that no normal person would wield it and could handle the full brunt of using Zaneizan without breaking.

Trivia

 * The Savage Cores have similar compositions to the variable stone, meaning that they can serve the same purposes.
 * The process that was involved in the creation of the Hundreds from the Middle Ages could be a reference to alchemy, which purifies, mature, and perfect certain materials.