Don't mind me. aaron2750 here. Just putting deviations in this story. Considering that I can't really get into deviantart due to the damn hsts safety bs. TOC don't mind me using this story. He gave permission to me.
Lore: After a few genocide routes, LB! Sans decided to fight against the human at the true lab. However, the human arrived faster than what LB has expected so he stalls for time until Gaster came and the DT extractor works again.
Phase 1: Not slacking anymore
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As Sans got attacked by the human, Gaster came just in time to reverse the slash.
Phase 1.5: Just in time
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Sans activated the DT extractor and successfully removed half of the human's DT.
Phase 2: The void calls back
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The machine starts to revive Papyrus and Sans increased his KR, shattered the fight button, and gained some of Gaster's powers.
Phase 3: An interesting experience
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After Papyrus and Gaster dies, Sans absorbs the DT that was extracted and now he's filled with determination.
Phase 4: *two monsters.
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At the end of the battle, Sans defeated the human with an unavoidable attack and when their soul is about to shatter, Sans contained the soul. He smiles as he turns into dust.