HEY I'm Getting Into Gravity Falls And Since I Don't Have The Book Of Bill Can You Explain Why Bill Has

HEY I'm getting into Gravity Falls and since I don't have the book of bill can you explain why Bill has that crack on his body? Sorry if this is a stupid question and ty for reading!!

Don’t worry, it’s not a stupid question! it kinda gets into spoiler territory for the book of bill/the show. basically, if you don’t mind HEAVY spoilers!!! (For the show and the book)

The reason he has the scar is because after he was erased from Stanley’s head the book shows that his body had been shattered (because of the whole “being punched in the face” thing), as he floats in space. At the end of the book of bill he makes a deal with the axolotl god so he can have one more chance to live. Afterwards he is shown with a glitchy scar across his “face.” I’m guessing they gave him the scar because his body was literally shattered and they wanted a visual distinction between post weirdmageddon bill and pre weirdmageddon bill. this makes very little sense depending on how much you know of the show but that’s kinda it. (Not to mention I’m bad at explaining things)