Will we ever get an explanation about what this gem was?

thunderfang's kidney stone

I think my biggest issue with S3 is there's so many unexplained things Like in Part 1 you have the blade in the Doll and the one Raz has, the forbidden 5 just being able fly, this stone and a few other things. From leaks Part 2 also seems to have some of these issues- and while

looks like shattered souls? thunderfang def has history with the dragonians

Méthamphétamine

This will either be explained 3 seasons from now in a throwaway line or by doc on bluesky

probably. but what we do know for now is that when this crystal gets destroyed it releases trapped things that make people succumb to the wants of who destroys it and be evil. basically like an egg. red crystal... i got no idea bro