Ok when the time hits 4am during nightmare mode nightmare freddy, bonnie, chica, foxy disappears then this nightmare black bear will appear. He looks like nightmare fredbear but he's black and has a gold bowtie and tophat and his name is just called nightmare and he has the same movement and mechanic's as nightmare fredbear. Also watch ambiance fnaf 4 video on how to beat night 7 on fnaf 4 he helped me know how to avoid nightmare, check the video out if you have got to night 7 on fnaf 4.