people who wait to play deltarune till its over or who havent yet started it will just never know what it was like on october 31st 2018 downloading a potential virus from twitter that literally just said "YOU ACCEPT EVERYTHING THAT HAPPENS FROM NOW ON"
If you look at his full splash art, you can see his Dark Knight self behind him. His story in the crossover is a what-if scenario of Cecil if he never overcame his darkness. Apparently he turns into THAT. If you know you know.