The Fanes Of Barovia
The land of Barovia is old, older than anyone realizes with many forces that have made it their own. The druids are one such group that has with their philosophy of show reverence to nature lead them to erecting stones that honor each of the geographic regions of Barovia. Perhaps though these stones are older, and tie instead to forces that called the land home before any living mortal walked the ground. Whichever you choose to believe the stones or fanes exist and have a deep connection to the land. There are many ways to introduce the fanes in the story through clever investigation to interactions with the valleys many Residents. The fanes provide incredible power to those who are able to tap into them giving them control over the land itself. Strahd long ago was able to gain control of them and through his servants, and occasionally himself, stop those who would rob him of those powers.