Allow me to preface this by saying that I've watched Mortis the Wizard's channel for a couple of years now and I don't believe this is a LARP. I found his channel because of my interest in the paranormal and he has some impressive spirit box sessions. One of his goals with these sessions is to prove that the spirits he's speaking with are demons who are tricksters and liars.
The following video is short, and you are exploring with him, so it's not edited down to satisfy those who are impatient about seeing the remnants of the rituals. The bones he finds do indeed look human.