Fatal Error Sans is/are notoriously difficult, and could take many attempts to successfully defeat. — Fatal Error Sans, speaking to you in his lobby of the Determined 7. Fatal Error is either the easiest or hardest member of the Determined 7, depending on if you get lucky with his patterns.

Fatal Error is either the easiest or hardest member of the Determined 7, depending on if you get lucky with his patterns. Like other Sans type bosses, he will pick up the pace as his health depletes and is unique in that he will send you to a fake version of the Lobby before returning to fight you at 100 HP.

Sans but he got caught by Error! Sans. However, he starts glitching after being in strings since Geno! Sans cannot actually die, due to his code. Read more about this Sans in his canon comic on Tumblr. Not to be confused with Evolution Geno! Sans (Gamepass) Theme: Digital Blood by FrostFM Sews 2 people with strings. Similar to the Underverse!

Unlike error sans however he cannot bind you to the air or both the air and the ground. Fatal Error spawns blasters that automatically locks on the player, and fires at the same speed as the other blasters. It does this five times before disappearing, and if you aren't strung already, this attack is always followed by such.