Booster

Are devices that make spirit artes more powerful. Though as a side effect there can be immense pain and death.

History
Boosters were created to make soldiers more powerful. There are also different generations of boosters.

First Generation
The first generation booster was used by Wingul, by having a booster implanted directly into his brain. The side effects were severe, but he felt any pain was worth it for the power it gave him.The side effects were his hair to turning white and being forced to speak Long Dau while in his powered up form.

Second Generation
Thanks to the data obtained from the experiments on Wingul, second generation boosters, boosters that are not directly attached to the body, are developed at the Labari Institute. Elize participates in the experiments and shows promising compatibility with the device, but her reserved personality prevents the researchers from obtaining much data from her.

Third Generation
To solve the psychological barrier preventing the team from getting results from Elize, a researcher has the idea of implanting the booster in a doll, along with a device that would enable the bearer to voice their inner thoughts. That is the third generation booster, Teepo. Teepo is an experimental, third-generation booster, designed to aid users of spirit artes achieve feats they were normally unable to. He was given to Elize during her time at the Labari Institute.