The gear is an extremely powerful palm-shaped object that can alter and influence the world. The spirits used it back in the beginning of time to create everything as it is now. For example, Yuuna made light and Kurai darkness. It can be used to alter the world in almost anyway. The only thing the gear cannot affect is the most basic element of existance: Ether. It can only use Ether to create bigger elements through combination. It can also be used for fast destruction.
In the early days of humanity, it was discovered and used by the leader of a tribe...
Alright. What do you suggest? It's pretty important that we are talking about bite-sized fragments though to keep consistent with what we already have.
I remember we had a similar talk about this in the past. I was under the impression that we got past it but I guess not, which is okay. The shape of the fragments were never described so we can be flexible.