Renavite

Renavite, a fairly old gemstone that dates back to the arrival of gems like Lapis and Emeralds. The gem itself was not very developed and had no real value amongst pawns. During the events of 2093, Tri set out a shockwave that enabled it's tru value. GAR's experiments revealed that it could grant any human the Teamwork Spirit, however this was not known until Tri stepped in and gave them a helping hand. After the experiments, all known Renavite that was found was brought under the GAR's security to produce an army of Spirits that would combat the oncoming threat mentioned by Tri.

Discoveries
Tri has some sort of connection with Renavite, as he was seen to manipulate and activate it to his will. Near the end of the Prolouge, Tri gives a younger Greyson another version of Renavite. Through Tri's tampering, he was able to edit the rock in such a way, that Grey absorbed the Initiative Spirit and gave back his previous Teamwork Spirit.