Pacifist Route

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The Pacifist Route is one of the three primary routes in Undertale Yellow. In this route, the final boss is Ceroba Ketsukane. Depending on whether the player spares or kills her, it ends with the True Pacifist or Flawed Pacifist ending.

Method

Like in Undertale, the Pacifist Route can be done by going through the game without killing a single monster. Unlike Undertale, reaching the Neutral Route's ending is not a prerequisite for obtaining either of the Pacifist endings.

The choice on whether or not to spare the final boss of this route determines which variant of the Pacifist Ending is obtained.

Changes

After sparing bosses in each of the area, all enemies in the respective area become NPCs at various locations for Clover to talk to when they backtrack, which is exclusive to this route.

Dark Ruins

When Clover is ready to leave, Dalv tells them that he plans to go to Snowdin after he packs up and leaves the Dark Ruins, which he says will take a few days.

Snowdin

Snowdin in the Pacifist Route is identical to a Neutral Route in which no monsters were killed in the area.

Dunes

During Ceroba's introduction at the Wild East, she is more friendly to Clover than she is on a Neutral Route and expresses she wants to help them leave the Wild East.

After reaching the Sunnyside Farm and gaining access to Fast Travel, Clover can recieve a letter from Dalv telling them that he moved to Snowdin. If Clover travels back to Snowdin at this point, they can find Dalv and other Dark Ruins monster NPCs throughout Snowdin.

Steamworks

Ceroba goes with Clover through the Steamworks, wanting them to travel with her to the Lab to find Kanako. This results in a different path than in other routes.

• Ceroba takes Flowey's place in most of the Steamworks' cutscenes. Flowey does not appear at SAVE points and only appears to talk to Clover when they are alone, during which he tries to convince them not to trust Ceroba.
• Ceroba interjects into many cutscenes and different dialogue in the environment.
• After falling through the trapdoor, Ceroba comes with an idea to build a "companion" for Axis as she is reluctant to fight him since Chujin built him. Clover builds Daisy using the junk around the room, which Ceroba holds on to.
• Ceroba shields Clover's SOUL to make them invulnerable for one hit in battles when she's present, which also means Clover does not get shielded against Macro Froggit and only gets shielded against Axis at the very end of his fight. During the battle against Guardener, despite Ceroba being present in this battle, she cannot shield Clover until all the menus are freed.
• The UGPS stations cannot be used when Ceroba is with Clover, as she does not want to bring attention to them. This prevents Clover from using Mail or Fast Travel that they would otherwise have access to on a Neutral Route without Ceroba accompanying them. They can use the stations again once Ceroba goes through the Hotland Elevator and Clover is taken back to the Wild East by Ed or after battling Axis if they aborted a Pacifist Route, causing Ceroba to leave them.
• Ceroba uses Chujin's passcode to enter the Factory at the crossroads. This path is exclusive to this route, as other routes lead Clover into the Chemistry Lab.
  • Mr. Screen appears throughout the Factory and forces them to box and sort goods to progress.
  • On the third floor, Clover and Ceroba have to sneak around the room and avoid Axis to find a door code by lighting furnaces. If Axis catches them, they are thrown down an elevator shaft to the first floor and have to return to the third floor to retry.
  • On the fourth floor, the door passcode is behind the manager's desk. Ceroba stops to read Chujin's performance reports about Axis's repeated failures. She is saddened that Chujin never shared this with her and is furious towards Asgore doubting him.
• After draining Axis's entire battery, he can be spared through 'Plan B' ACT, where he becomes infatuated with Daisy.

As Ceroba prepares to lead Clover to the Lab, they are stopped by Starlo and Ed, who discovered a trap door leading to a bunker full of incriminating research while preparing a party for Kanako's return. When Starlo demands to know what Ceroba is planning, she flees through the elevator, with Starlo chasing after her. Before leaving, Starlo orders Ed to take Clover back to the Wild East.

Endgame

Once back, the others Feisty Four members show up. Martlet arrives as well, as she was contacted by Moray. Martlet convinces Ed to have Clover follow her to the Ketsukane Estate to investigate while he explains what he knows to the group.

At the estate, they locate the trapdoor Ed discovered. They enter Chujin's secret study and watch his video journal. These videotapes detail his plans to create a serum allowing any monster to become as strong as a Boss Monster, which led to him experimenting on himself and causing his demise. His last tape is him telling Ceroba to find a human with a pure SOUL and kill them to finish his work. Horrified, Martlet takes Clover out of the estate and meets up with the Feisty Four, convincing them that she and Clover need to go and stop Ceroba. She flies ahead to Hotland and the Feisty Four wish Clover luck. Clover begins to walk away but is stopped by Flowey, who mocks them for trusting Ceroba. However, rather than continuing to tell them to leave Ceroba, Flowey says that he supports Clover and is curious about what will happen next.

Clover can find Chujin's gravestone to the northwest of the estate. If they inspect its backside, they can find a secret Videotape. This tape reveals that Chujin sent Axis to apprehend the human that attacked Kanako, but Axis killed the human due to an error. Chujin quickly hid the evidence and confiscated the human SOUL for experimentation.

At UG Apartments, Clover meets up with Martlet on its roof. She explains where Ceroba and Starlo are. She tells Clover that they are a kind and peaceful person in spite of all their hardships, contrasting what she was told as a Royal Guard. She then promises Clover that after they diffuse the conflict with Ceroba, she will convince Asgore to let Clover free and promises to meet them again when the barrier one day breaks. The two share a fist bump before heading down and through the elevator to New Home.

Once there, they find Starlo and Ceroba in a standoff, where Ceroba reveals that she believes Kanako is dead. Despite both Martlet and Starlo's attempts, Ceroba refuses to back down. Martlet attempts to flee with Clover, but Ceroba knocks out both her and Starlo with little effort. She goes on to state that Clover, while admirable, is naïve for thinking that the five humans can be saved or that Asgore would let Clover go. Admitting to be a hypocrite and no better than Asgore on morality, she reasserts she will protect Monsterkind by completing Chujin's work, stating that if Asgore did break the barrier, humans would only defeat them again and imprison them again.

She and Clover then fight. At first, Clover survives Ceroba's attacks, but once brought to the tipping point, she assaults them with a barrage of attacks. Before the last hit can strike, Clover unlocks the Yellow Mode and blasts back. Realizing the situation, she puts on Kanako's mask and takes a kitsune-like form. Clover eventually cracks the mask, which causes a memory to play out before the two of them. The memory is of Chujin on his deathbed, who tells Ceroba of the bunker where he worked on his project, with Kanako having heard everything. Ceroba is initially startled by Clover being in their head, but continues fighting. Clover manages to chip away more of the mask, revealing another memory of Kanako and Ceroba in Chujin's bunker. In this memory, Kanako finds out about Ceroba's plan to create a Boss Monster serum. Ceroba's note, that she threw out in the garbage, alleges that she removed any corruption Chujin's previously used serum held, and so Kanako pleads Ceroba to volunteer as a Boss Monster in the experiment. Ceroba then injects Kanako with the serum, causing her to "fall down." As Ceroba lays silently before Clover, she reveals how deep her sins are and is "chasing the one ray of sunshine peeking through the surface", unable to let go, and gets up one last time. Eventually, Clover manages to overwhelm and destroy the mask, reverting Ceroba back to her normal state. As she lays defeated before Clover, she eventually realizes her attempts at fulfilling Chujin's legacy costed her family, and made her attack her friends and a child, for something that may not even work. Racked with guilt, she begs Clover to finish her. What happens next depends on what option Clover chooses.

True Pacifist Ending

Most might act cheerful, but life down here...
...It's hopeless.

Ceroba, in Clover's flashback sequence, before Clover makes the decision to sacrifice their SOUL

The True Pacifist ending is reached by selecting the Mercy option 3 times at the end of the final battle against Ceroba. Ceroba, confused as to why Clover is sparing her, is interrupted by Starlo waking up and brushes off her concerns as payback for how he acted back in the Wild East. Martlet wakes up as well and tries to help Clover escape before Ceroba calms her down by revealing that "We had a duel. Clover won." Ceroba then apologizes for how she acted, having been too obsessed in her quest to fulfill Chujin's legacy, before being comforted by Starlo. Martlet also promises to use her Royal Guard connections to the royal scientist to locate Kanako. Ceroba apologizes to Clover for attacking them, stating that what she said back in the Steamworks wasn't false, and spending time with them helped her forget her troubles, with the child walking up and hugging her as an act of forgiveness.

With everything now done, Martlet prepares to take Clover to Asgore and the barrier, but Ceroba shoots it down, stating that Asgore would not care that Clover is a pacifist, and would try to take their SOUL. Martlet, Starlo, and Ceroba all argue as Clover begins to think to themselves. Remembering that monsters have suffered while trapped in the mountain, Clover ultimately decides to give up their plan to rescue the five human children, and instead offers up their own SOUL so that one day, monsters can finally have a future. Despite Martlet and Starlo's insistence that they don't need to do this, Ceroba realizes that their intent is serious, and agrees to take their SOUL. The four then share one final hug before Martlet and Starlo leave, with Clover giving them their hat and gun respectively as a farewell present. Ceroba then admits that Clover has gained her respect before extracting their SOUL. After the deed is done, Clover sends her off before collapsing. Flowey is then heard, expressing his disappointment at Clover becoming "predictable" by sacrificing themselves before stating that while he could RESET everything, he believes that the child has earned their rest, stating that there is always another. Flowey then says his farewells to Clover before leaving, stating that they'll meet again (likely a reference to Flowey's plans to take the human souls). Clover then crawls up the side of the wall to pass away peacefully.

As the credits roll, the fates of several characters, both major and minor, are shown playing out after the trio gives Asgore Clover's SOUL such as:

• Toriel walking by her tree in the Ruins as its last leaf falls off.
• Dalv performing on his organ for an audience in Honeydew Resort.
• Mo's business venture, depending on how many items were bought from him.
  • If 0-3 items were bought, Mo's business is a failure and he sits by himself with a coffee in hand.
  • If 4-8 items were bought, Mo's business is successful, with people lining up to purchase his popsicles.
  • If all nine items were bought, Mo's business becomes incredibly popular and he gets the Shufflers to work for him.
• Slurpy's fate, depending if their side quest was completed or not.
  • If not completed, the Red Miner tries to pull off Slurpy from the pole but fails, to Slurpy's misery.
  • If completed, Slurpy is seen swimming in Honeydew Resort's hot springs.
• Bryan's fate, depending on if his hardhat was returned or not.
  • If the hardhat was not returned, the mine workers mess around with minecarts while Bryan stands to the side and sheds a tear.
  • If the hardhat was returned, then Bryan gets promoted to being the new foreman and their fellow mine workers applaud.
• Violetta with Rock Man, tending to the Oasis Valley sprout. After it suddenly blooms, Violetta and Rock Man share a laugh.
• The Wild East being delivered corn thanks to the Feisty Five and Starlo's parents, with Starlo having accepted his farmer background again.
• The Guardener still hibernating, with her third backup Lil' Bot holding her flower and leaving with another bot.
• Axis on a date with his "spouse" in the Steamworks riding a gondola, with Sousborg rowing.
• Ceroba knocking on the door of Dalv's new house while holding corn she bought from the Wild East.

In Waterfall, Martlet is seen preparing a small raft to send Clover off properly, before placing Clover's hat in the raft. As she does so, she reveals she declined a promotion and quit the Royal Guard for more important matters. Just then, Ceroba and Starlo arrive, with the cowboy putting Clover's gun in the raft. Ceroba then reveals that she invited Dalv to join the event, before Starlo then places the Safety Glasses on the raft as well. Martlet then places the raft in the water and sets it off, everyone saying their farewells to Clover. After the last set of credits roll, the raft falls into the Garbage Dump, with the hat and gun landing on a patch of golden flowers.

The game suddenly fast-forwards to Frisk's fight against Photoshop Flowey. They call for help, and Clover's SOUL answers it. The game then ends on a cinematic shot of Clover's hat and gun before closing. Opening the game again has Flowey conflicted on whether or not he should try again to get a different ending, or just accept it and wait for another human to fall. Then, the player is given the choice to RESET or wait.

Flawed Pacifist Ending

Regrettably..
The one thing these encounters never are is "different."
Not in the end.

Asgore

The Flawed Pacifist ending (also known as the Asgore ending) is reached by selecting the Fight option at the end of the final battle against Ceroba. She thanks Clover for freeing her of her guilt, happy to be reunited with Chujin again. Upon doing this, Clover kills Ceroba, leaving behind Kanako's shattered mask. Once Starlo and Martlet awaken to witness the scene, Starlo becomes furious and lashes out at Clover for killing his best friend, while Martlet defends them, stating that Ceroba was unreasonable and violent and Clover's actions were justified. Following this, Starlo somberly proclaims that while Clover's actions may have been just in the eyes of the law, he does not forgive them and considers them "lower than dirt". Carrying Kanako's shattered mask, Starlo silently leaves New Home.

Martlet guides Clover to Asgore's throne room, presenting Clover to him, which momentarily shocks the king. Martlet attempts to reason with Asgore, pleading the case for Clover's pacifism and asking for them to be sent back to the Surface. Asgore, however, is undeterred, and reaffirms his no-tolerance policy towards humans, saying that Clover is not any different from the others. Martlet is devastated by the turn of events and asks Clover to defend their case, but Clover accepts the fate that stands before them and quietly indicates that Martlet should be on her way.

After Martlet leaves in sadness, Asgore brings the child to the Barrier and reveals his five collected human souls. Clover briefly looks at them and then draws their revolver. Briefly, Asgore gives his sympathies to the child, saying he is well aware of the feelings they are experiencing. He promises he will make the fight quick before initiating a battle.

This battle is different from the standard encounter format of Undertale and Undertale Yellow: while there is a Bullet Board and a yellow SOUL representing the player, no other parts of the user interface are present, including Asgore's battle sprite. Attacks from Asgore keep coming in one never-ending wave, most being similar to the ones found in Undertale, but also including some that cannot be dodged. The player never gets their turn and Asgore's turn continues until Clover is killed, at which point one of the empty SOUL receptacles appears and envelops Clover's SOUL. The receptacle joins the five others, and Asgore apologizes to the human one last time before the credits roll.

Post credits, Flowey is seen talking to himself, and decides not to RESET things, instead opting to wait for the next Human to fall so that his plans can come to fruition.

Trivia

• Sousborg makes a cameo appearance in the credits of the True Pacifist ending, rowing Axis and Daisy's gondola, even though players cannot encounter him during the True Pacifist route because Chemistry Lab is inaccessible.
• When viewing the Stat and/or SAVE Point menus after killing Ceroba in the Flawed Pacifist ending, it is shown that Clover gained no EXP and remained at LV 1 following the encounter.
• Despite its name, Flawed Pacifist ending cutscene is considered a Neutral Route ending internally as opposed to a Pacifist ending.
• Martlet being attacked into fleeing during her Snowdin battle does not abort the Pacifist Route, as she is not killed.
• According to the Undertale Yellow Artbook, Martlet was originally going to put up a bit more of a fight on Clover's behalf, in the Flawed Pacifist Ending, and Asgore would have called the Royal Guard to escort her out, screaming and kicking for Clover as she's dragged out.