Chapter Summaries

Murder hunted monsters through the Core and True Lab to raise his LV before facing the human, then trapped the human in blue bones for an hour. When the human reached the corridor afterward, Murder was nowhere to be seen.

• Murder left Waterfall and swept through the Core, killing every monster he found to gain LV.
• Murder entered the True Lab and destroyed the amalgamates, telling himself he had freed them.
• The wounded human entered the True Lab, and Murder attacked with bones, Shock Waves, and Gravity Manipulation before trapping him in blue bones.
• Murder chose not to kill the human yet and left him imprisoned for an hour so he could gain more LV.
• The human escaped when the blue bones crumbled and reached the corridor, where Sans was absent.

The human searched the Underground for Murder Sans but encountered a powerful, female Sans named Killer, who killed him and took his soul. Murder Sans returned to the Core, discovered signs of a battle he had not fought, and realized he was no longer in his own timeline.

• The human searched the True Lab, the Core, Waterfall, and Snowdin for Murder Sans.
• In Snowdin, the human confronted a female Sans who identified herself as Killer and recognized him as a monster.
• Killer disarmed and killed the human, then used her determination to prevent him from relying on his save.
• Killer wondered whether something had happened in her world and set out to investigate.
• Murder Sans returned to the Core and found knife-slash marks and other signs of an unfamiliar battle.
• Murder Sans and Paps concluded they were no longer in their timeline, and Murder Sans began retracing his steps.

Murder searched the apparently deserted timeline while Killer arrived in the corridor and was forced into Stage 2. After the two fought, Murder distracted her with a cartoon tape and led her to his room, leaving their conflict unresolved for the moment.

• Murder searched Snowdin and the corridor for signs of a battle but found no one, then waited by reading his novel.
• Killer reached the corridor as the timelines merged, met Murder, and warned him that she was about to enter Stage 2.
• Killer transformed and attacked, and Murder fought her with magic, blasters, and summoned cannons.
• Murder showed Killer a collector's-edition cartoon tape, which caught her interest and persuaded her to follow him to his room.

Killer recovered from Stage 2 and explained her soul’s stages to Murder before offering to help him save his universe and travel the multiverse. Murder accepted her offer, and Killer began planning how to keep her soul stable and protect herself from Nightmare.

• Murder found Killer on the floor after she screamed, but she woke and told him she had returned to normal.
• Killer explained that her upside-down-heart soul meant she was normal, while its target and melting forms signaled increasingly dangerous stages.
• Killer told Murder that circumstances had let her urge to kill overwhelm her sense of self, and she mentioned that Nightmare could have made Stage 2 harder to suppress.
• Killer offered to help Murder reset his universe, end his nightmares, and travel with her to stop tragedies in other universes.
• Murder accepted Killer’s offer, and she enthusiastically welcomed him as a partner.

Killer and Murder reset the Underground while preserving Murder’s memories, then left Snowdin together as partners. The chapter ended with the two setting out across the multiverse.

• Killer told Murder her determination was stronger than the human’s, and Murder burned the human’s corpse.
• Murder revealed that his room’s Determination TV Amphibian Model 1000 could protect it from resets, and Killer reset the Underground.
• Papyrus found Sans’s note saying he had left, with money for her and instructions to care for his Pet Rock.
• Killer agreed to help cover Papyrus’s expenses and admitted she had worked as an interstellar pirate.
• Killer and Murder introduced themselves, clasped hands, and began their partnership across the multiverse.

Murder and Killer used the True Lab’s Determination Extractor to stabilize Killer’s soul so they could leave Dusttale. After a strange encounter with Dr. ▇▇▇ and Killer’s three-day recovery, they set off for the multiverse.

• Killer led Murder to the True Lab, where they operated the Determination Extractor while sealing the room against the approaching amalgamates.
• Murder saw Dr. ▇▇▇ appear, though Killer could not see him, and received a device that would let the doctor appear and help in battle.
• Killer collapsed after running the Extractor, and Murder found that she had used dangerously high treatment parameters.
• Killer woke after three days with her soul stabilized in its current state and explained that her method would preserve it indefinitely.
• Murder took Killer’s hand, and they opened a rift and left Dusttale for the multiverse.

Murder and Killer crossed a deserted Underground and found an unfamiliar white door that Killer believed was linked to the mysterious force disrupting her. They reached ULB’s battle with the human just as an unseen intervention sent the human flying and two figures appeared beside ULB.

• Murder and Killer traveled through the empty Ruins and Snowdin, finding the Underground covered in the dust of fallen monsters.
• Murder unlocked Sans’s house, where he and Killer found the refrigerator full of little white dogs.
• In Waterfall, Murder and Killer discovered an unfamiliar white door that opened onto empty darkness, and Killer suspected ▇▇▇ had interfered with her.
• Murder and Killer used a shortcut to reach the corridor, where they heard a battle and rushed toward it.
• The human’s blade nearly killed ULB, but it veered off course; ULB drank ketchup to restore her HP and prepared to fight again.
• An unseen force used gravity magic to send the human flying, and two figures dressed like ULB appeared beside her.

Murder and Killer joined ULB against the human, and Killer prevented the human from loading. The human remained trapped beneath their attacks, but recognized the two newcomers as Killer Sans and Murder Sans and found Killer unexpectedly cute.

• Murder and Killer appeared beside ULB and agreed to help him fight the human.
• The human recognized the newcomers as Sans and decided he would kill them too.
• Killer warned the human to check whether he could still load, and he discovered the load menu had turned gray.
• Murder summoned blasters while ULB readied his bone, and Killer raised an enormous blaster that pinned the human down.
• The human recognized Killer Sans and Murder Sans and thought Killer was much cuter than he had expected.

ULB, Murder, and Killer coordinated their attacks against the human, overwhelming him with blows, bones, and magic. As ULB ran out of stamina, Killer saved with golden light in her hand.

• Murder and Killer timed their cannon blasts to force the human into ULB’s attack, and ULB cracked his head with her bone.
• Murder dazed the human with a hook while Killer slashed him repeatedly, then Murder kicked him into the air.
• ULB kicked the human down the corridor, and Murder manipulated gravity as the three pursued him.
• Murder, Killer, and ULB unleashed waves of bones, energy, and blade attacks against the human, with ULB adding blue bones to Murder’s assault.
• ULB sank to one knee from exhaustion, and Killer quietly saved as golden light glowed in her hand.

Murder and Killer fought a human whose HP had been modified, while ULB suddenly became possessed by ▇▇▇ and began destroying the timeline. The human lost access to actions and Debug and was left with -1/1 HP, face-to-face with ULB.

• ULB rested while Killer and Murder continued fighting the seemingly unkillable human, and Murder used a device to summon ▇▇▇.
• ▇▇▇ revealed that the human's HP had been modified to 128/999, but an attack passed through the defenders and his projection vanished amid interference.
• ULB thanked Murder and Killer in ▇▇▇'s voice, then declared that the human had to be eradicated as the timeline began to fall apart.
• ULB's eyes filled with white code and cracks appeared across her face as four blasts rang out, while the human lost the ability to select actions.
• The player discovered that Debug no longer worked and the human had only -1/1 HP before ULB's face appeared close in front of him.

ULB, Killer, and Murder repeatedly attacked the human, whose body regenerated because of the -1 HP modification. As the timeline collapsed around them, ULB condemned the human for resetting lives and hurled them back toward the corridor.

• ULB blasted the human into a wall, crushed and tore their body apart, and watched them regenerate under the -1 HP modification.
• Killer and Murder joined the fight, impaling the human with bones before Murder launched them into the ceiling and Killer slashed them into the sky.
• ULB confronted the human amid a collapsing, code-filled world and accused them of resetting lives for the sake of exploring outcomes.
• ULB summoned a giant ███ blaster, which bit into the human, then threw the regenerating body down toward the corridor.

ULB, Murder, and Killer defeated the human, but ULB died in the process. Killer loaded a save that restored ULB and left the human helpless, then offered ULB a way to return to peaceful days.

• Murder struck the human with a Rising Dragon Fist while ULB and ███ attacked his soul, killing him.
• ULB collapsed and died after ███ left her body, remembering Undyne, MTT NEO, and Papyrus as she turned to dust.
• Killer revealed that she had saved earlier, then loaded the save to repair the world and restore ULB.
• Killer cut off the human’s head while he stood motionless, and she and Murder helped ULB to her feet.
• Killer told ULB that the human could no longer enter her world and offered a way to restore peaceful days.

Killer and Murder helped ULB reset her universe after the human’s world collapsed, then left to travel to another universe. Meanwhile, Bill Sans considered Killer and Murder intriguing, while Delta Sans refused his deal and departed.

• Killer explained that the human’s world had collapsed after ULB died, and that she had saved a copy before the collapse.
• Murder told ULB that Killer could reset her universe, and Killer offered to help.
• Killer, Murder, and ULB introduced themselves, became friends, and Killer reset the universe.
• Killer and Murder left through the spacetime corridor to head to another universe.
• Bill Sans asked Delta Sans to reconsider a deal, but Delta refused and left through a spacetime gap.
• Bill Sans took an interest in Killer and Murder and wondered whether they were worth making a deal with.

Murder and Killer explored a strange timeline where a grotesque Flowey watched them and fled. At a Save Point, Killer found its text corrupted with bizarre characters, and Murder's device could not explain what happened.

• Murder and Killer entered the timeline and encountered a grotesque Flowey, who giggled, burrowed underground, and fled.
• An unseen presence cursed them with "DIE," but no one appeared, and the two continued onward.
• Killer found a Save Point and held Murder so he could see it.
• Killer touched the Save Point, which displayed a flood of bizarre characters and the message that someone was filled with [Swap_ADJ].
• Murder checked his device for an explanation, but it did not respond, while Killer said she had never seen anything like it.

Murder and Killer found Napstablook reduced to a crying puddle and encountered a flower that thanked them before losing its petals and disappearing. After entering the snowy region, they were confronted at the bridge by Sanstrosity.

• Killer poked the jelly where Napstablook had been, and it sprayed liquid before whimpering and crying.
• Murder recognized the jelly as Napstablook, and he and Killer went around it and continued toward the Ruins doors.
• Murder picked up a locket for the flower, whose petals fell away as it thanked them and then cried for help.
• Murder and Killer put on the locket, entered the snowy region, and heard strange howls and trampling footsteps along the way.
• Murder and Killer reached the bridge, where Sanstrosity appeared behind them and startled Killer.

Murder and Killer fought Sanstrosity, then used ketchup to calm him long enough for Murder’s pendant to guide him to shatter Sanstrosity’s soul. The monster souls scattered as the world reset, but something had changed.

• Murder and Killer dodged Sanstrosity’s strange bone and reversed-blaster attacks.
• Murder tossed ketchup to Sanstrosity, who showed a deep longing for it.
• Murder gave Sanstrosity three more bottles of ketchup, causing him to vibrate and speak in strange phrases.
• Murder’s pendant resonated and guided his hand to touch Sanstrosity’s soul, shattering it and releasing the monster souls.
• One soul fell and the world reset, but something had changed.

Murder and Killer met Tale's_end Sans and Science Sans, who explained that the beings called [Entities] could not be killed by normal means. Murder suggested he might know a way to deal with them, and Science Sans led them to one nearby.

• Murder and Killer woke in Tale's_end Sans's Lookout, where he welcomed them and said he would take them to another Sans.
• Tale's_end Sans brought Murder and Killer to Science Sans, who explained that the beings they had encountered were called [Entities].
• Science Sans said [Entities] resembled Amalgamates but could not be killed by normal means, and that everyone was at a loss about them.
• Murder said he might know a way to deal with the [Entities], and Killer vouched for him.
• Science Sans believed them and led Murder and Killer toward a nearby [Entity].

Murder and Killer encountered the monstrous P.a.p.p.y. in the blizzard and struggled to evade her attacks. Instead of harming them, P.a.p.p.y. caught them in a tight embrace and tickled them.

• Murder and Killer approached a bizarre figure through the blizzard and discovered it was P.a.p.p.y.
• P.a.p.p.y. fired lasers from the black holes in her heads, then attacked with extending arms.
• P.a.p.p.y. screamed, disrupting Murder and Killer's thoughts and sending them falling.
• Murder told Killer to wait, but P.a.p.p.y.'s hands caught them both.
• P.a.p.p.y. hugged and tickled Murder and Killer while they endured the stench of rotting flesh.

Murder and Killer washed Papalgamate with water until it became friendly and the pendant vibrated. Murder shattered its enormous black soul, releasing countless monster souls, and two souls fell as it became time to reset.

• Murder and Killer recalled that satisfying the entity and using the pendant had defeated it before, and Murder suggested washing it as an alternative to making spaghetti.
• Murder formed a water projectile and washed Papalgamate, stopping its heads from screaming.
• Killer warned Murder as Papalgamate's hands emerged from the ground, and they dodged its attacks.
• Murder washed Papalgamate again, clearing black holes from its heads and eventually making it friendly.
• Murder touched Papalgamate's black soul with the vibrating pendant, shattering it and releasing countless monster souls.
• Two souls fell as the reset approached, though some things had changed.

Murder and Killer continued through Swap Papyrus’s world, where they learned that a hostile Skeleton King demanded worship. Swap Papyrus gave them a cigarette she said was the king’s weakness, and they headed toward the final confrontation.

• Murder threw away a letter instead of reading it, and she and Killer continued through the Ruins and Snowdin.
• Swap Papyrus met them beyond Papyrus’s bridge, learned they did not want to fight, and warned that the king demanded worship.
• Swap Papyrus appeared again at the ice rink and urged them to give up as they neared the king’s residence.
• After Killer saved at a Save Point, Swap Papyrus gave Murder a cigarette and said it was the Skeleton King’s weakness.
• Killer and Murder suspected they were approaching the final boss, and Murder kept the cigarette because she smoked occasionally.