The boy fanatically cared about his dead aunt, and he fanatically tried to reach his dead aunt -- on the other side.
Dealing with occult is a dangerous game to play...
This boy found out the hard way. If you read the book Possessed: The True Story of an Exorcism, you will understand this.
I remember lots of urban legends about Ouiga back in the 70’s. One was supposedly the family tried to burn it after they discovered it was evil but it would NOT burn. So they finally sold it at a garage sale. I guess it’s still out there somewhere.
Indeed it is.