On the PGCC
It is related to Shaman and Tribal Barbarian.
I had other people come join the mosh-pit of adamantine golems I had spawned and they got shredded. I was also able to damage other players, and they were unable to damage me.
I am currently working on writing out the entire build so contributors may take a look at it to find the issue, which I will happily provide upon request in PM/Discord.
