Today's free content is the history behind what it was that caused the stones to become magical. I don't know about other DMs but I used to think that the history of a location was just for background. It's only in recent years that I realised it could be the basis of an adventure - moving the history to the current day and having the characters get involved in the events listed.
We will be posting this content out in different locations online. If you know a good forum or group that we should be posting them in then do please let us know - email@example.com will reach us.
Until next time, stay safe and keep gaming.