Orphan

The Cutie Mark Crusaders walked home to their tree house in the park after the concert. It were a late summer night, as the three ponies walked in the quiet park after the concert. Nopony else were in the empty park beside the three fillies. The ponies saw a fast thing pass by them. It could be Pinkie Pie or a wild animal. But it was not.

"What the hay." had Scootaloo said.

"Whatever that is just run to the clubhouse." Apple Bloom said to her two friends.

The three startled fillies rushed to the clubhouse. Even as the thing had not been in sight, were the three fillies running without stopping. The fillies reached their clubhouse at last. After seeing that entity in the park had the three ponies not being able to sleep. The morning after had Scootaloo and her friends gone over to visit Twilight in her library.

"Twilight knows much about legends and myths, so she might know what that was we saw." Scootaloo said to her friends.

The fillies talked with Twilight about what they saw last night in the park. Twilight knew what that thing was, as she had a book with legends from Appleloosa and Dodge Junction.

"Once upon a long ago in the West the bison had much bigger land before the ponies arrived." Twilight read in her book.

"Every night the bison had visits by the very old ghosts called El Muerto." the alicorn read.

"Still these days in the West El Muerto are seen." Twilight were reading.

So later that night had Twilight went out with her spell book to confront El Muerto in the empty and dark park. At midnight had El Muerto shown up, and ponies in Ponyville had lately been told to see it. Twilight got startled by seeing the thing, but she fired her laser from her horn. That was the same laser the Windigos got defeated with by a book from the bison tribes. The thing disappeared  after being hit by Twilight's laser. From that night none had seen El Muerto in that park again.