Buckdewey Stories

Nightmare had hit his breaking point, and ate the apples. Powered by their corruption, he was covered in negativity and fed off of the villagers fear before killing them. His brother's voice got through to him before he petrified him though, and Nightmare ran. He soon woke up in an unknown place, a gem embedded into his chest and a battle happening near him. What is a 'monster' like him to do?