The cellar is a circle carved into stone, rings within rings, and one chair at the centre that has been sat in a great deal.

The epitaph is four lines of gold. It is not a riddle. It is a sentence with the words moved around.

Read one way it says: the witch is the board.

Read the other way it says: the board is the village, and the village agreed.

Both readings are true. That is the trick. She has been winning an argument with herself for two hundred years and you are the noise it makes.