to quote the wiki about the latest twist in fnaf: “The details of the incident were later revealed during the Custom Night, once the player beats a game mode on V. Hard, they get a minigame cutscene of a character (presumably, Eggs Benedict or Purple Guy), walking out of a building and being waved at by townsfolk. As the player continues up to six modes on V. Hard, they get the same cutscene but with small changes ranging from people avoiding him or just looking away from him. His skin also appears to rot as the cutscenes progress. In the final cutscene, he is completely purple in color. When no one is looking, his pupils disappear when he starts twitching. His torso moves around in an unusual manner and he vomits up what appears to be animatronic parts into a sewer drain, before collaping. A moment of silence ensues before the player hears Baby’s voice, repeating “you won’t die” as it gradually gets louder. The speech gets faster and faster, sometimes overlapping each other, until the character rises up in an inhuman fashion. Many eyes are also visible in the sewer drain a short time afterwards.
After beating V. Hard Golden Freddy mode, the following quote is heard.
“Father. It’s me, Michael. I did it. I found it. It was right where you said it would be. They were all there. They didn’t recognise at first but then they though I was you. And I found her. I put her back together, just like you asked me to. She’s free now. But something is wrong with me. I should be dead. But I’m not. I’ve been living in shadows. There is only one thing left for me to do now. I’m going to come find you. I’m going to come find you.”
After this, Springtrap appears before the screen goes black.”