Three years ago when I went to Mexico to visit my grand parents, I went to the plaza to hang out with my cousins. We were just chilling throwing fire crackers at the stray dogs that passed. It was getting late so I started heading of home to my grandparent's house. It was 2a. M and I was walking on my own. As I was about to get onto the main road, I saw a lady that looked like a nun. As I got closer I saw that her hands were together as if she was praying so I said, "hola". She didn't respond. I couldn't see her face either. As I walked past her I looked at her face. It was all bone and teeth so I ran the rest of the way home.
I was shaking when I got home and my parent's asked what the matter was with me. I told them what I had seen. My grandparent's then told us that there was a war in the pueblo "atenguillo". The town's church was fighting for its religion. There was nun who went to a house nearby to hide gold as well as hide from the people were attacking them.
A few days later we went to the old house and saw that there was a hole that was being dug so we went to the house to get shovels and started to dig. About two hours later we hit a circle rock and it was heavy so we asked one of my grandfather's friends to help us. He said he would help us. The next day we went to go pick him up he told us that he was not going there again. When we asked why and he said he went the day before to get the gold but when he got the rock out it was a well and had an awful smell. There was gold in the bottom of the well. A few weeks later my grandfather's friend got really sick.
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The nun's praying, yeah I agree to Mexico's sad history. Maybe it was right that you saw nun praying because to save gold & people. But I think that it was nun's spirit still there and praying. Your digging may have made it go cruel or evil because of your statement that there was a foul smell there. Your grandfather's friend may had fell sick because of helping you and digging in the well that the nun didn't wanted and so to save it, she has (not sure) done something to your grandfather's friend. By something, I mean that either haunting him because a nun's spirit has power.
By the way, I recommend to stop the digging there & there only for the good of you and your family.