Nightmarionne is one of Nightmare's Minions. He is leading the work on Project A
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Nightmarionne was created in Freddy Fazbear's Pizza I together with the other Nightmare minions. He joined them on the raid on Freddy Fazbear's Pizza II and killed one of the cops when they returned. He helped take over the factory, where he assisted Nightmare in providing power for the army.
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Nightmarionne took the lead when working on Project A. After 100 years of The Nightmare War, he was reaching the final goals of the Project. He sent the information to Nightmare and he came to visit him in the factory. Upon Nightmare's arrival Nightmarionne informed him that it should take 48 more hours to destroy all alternate realities and a week to open a portal for the Guest. Nightmare was satisfied, however he then asked Nightmarionne about his assistant, P1. He eventually wanted Nightmarionne to destroy him as he did not permit his creation. After he left the factory, Nightmarionne did not destroy P1 and told him to move all his equipment. Later he was confronted by Nightmare Bonnie who wanted to know why he doesn't talk to the other minions. Nightmarionne did not want to interact with him, however when Nightmare Bonnie tried to block his path and punch him. Nightmarionne easily stopped him and broke his arm, then told him to stay out of his way and left.