Ooh just had a thought. The well is a wishing well. You can throw in a coin and make a wish, but it consumes you totally to do so.
So Reginald wished for his family to get over the plague, it worked, but he is now bound to the well. A trade he is happy with. His grandkids have moved to another town though and he wants to be moved there to keep watching over them.
One day somebody will make a wish, Reginald will spend the last of his power to make it happen. Then he can move on and the next supplicant takes his place. It is not a trap, the well clearly states its price.
So Reginald wished for his family to get over the plague, it worked, but he is now bound to the well. A trade he is happy with. His grandkids have moved to another town though and he wants to be moved there to keep watching over them.
One day somebody will make a wish, Reginald will spend the last of his power to make it happen. Then he can move on and the next supplicant takes his place. It is not a trap, the well clearly states its price.