I'm gonna be frank: I don't even vaguely remember what my intention was.
I think they're supposed to be available from the start as playbook-specific items, since that would make it 5, just like in other playbooks.
Ok that clears stuff up, significantly! And then in the Bonecarving section, where it mentiond that the player has one Charm already known, Is this an additional charm to the 3 available?
Yes
