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- WARNING! This AU contains suicidal content!
Erasure Inverted is an AU where, instead of Gaster getting erased and Sans remembering it, Sans gets erased and Papyrus remembers it. Papyrus becomes depressed (may or may not commit suicide).
Papyrus acts peppy and cheerful on the outside, but on the inside he has severe depression and misses his brother a lot.
Sans does not exist, and will never be brought back.
Gaster does not remember Sans, thinks that Papyrus was an only child, and that he built the CORE and tested it with no issues. He has forgotten Sans completely.
Undyne was injected with Determination and is therefore very determined, more so than in original Undertale.