The Lobotomy Night AU is a bad ending timeline in which Night survives-but loses himself completely.
After the events of "Earth is Going To Kill!", Night is given an ultimatum: death or lobotomy. Knowing execution is imminent and believing survival is the only way forward, Night chooses lobotomy. The procedure removes his controlling codes, but it also destroys large portions of his subconscious identity. The truth-that Night may have been under mind control-dies with that erased part of him and is never discovered in this AU.
Although Night lives, the original Night is canonically dead. What remains is Lobotomy Night: a new person with a different personality, fragmented emotions, and no access to his former memories. He is not empty or robotic, but he is fundamentally disconnected from who he once was. His condition resembles severe identity loss rather than simple amnesia. Memories of his past surface only as dreams, static feelings, or unexplained emotional reactions.
Because Night never regains his memories, he is permanently denied the chance to redeem himself on his own terms. Redemption is instead forced through erasure, stripping him of agency rather than allowing growth. While others technically "give up" on the original Night, they remain deeply affected by his loss, treating Lobotomy Night as a replacement rather than a continuation.
Mars, who performs the lobotomy, is left profoundly traumatized. He never wanted to act as judge, jury, or executioner, yet is forced into that role. He does not see the procedure as mercy-even though Night survives-but as the destruction of a self to create another. The uncertainty of whether Night would even live haunts him, and he carries the guilt as though he has blood on his hands.
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