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"mistakes were made. "
– Seraphim! Sans
After a Genocide Route, Sans becomes fearful that Frisk would never come back after a Genocide Route. In a state of panic, Sans kills Frisk and takes their SOUL at the beginning of the timeline, and when Asgore refuses to fuse with the other six to free them, he does so himself, believing that this is the best for all monster-kind. He then breaks the barrier.
Meanwhile, Papyrus discovers Frisk's corpse. Not knowing how human death works, he takes it to Undyne, who goes along with it as to not upset him. They both go to ask Alphys about where the SOUL and Sans went, and they rush over to the castle. There Undyne tries to assault a hulking beast, who turns out to be Sans in his new form.
Toriel then arrives. Furious at Frisk's death and believing its Asgore's fault, she launches an enraged and heartbroken assault. She recognizes Papyrus' name from her conversations with Sans and gets stopped from her useless attacks by a certain fish duplexing her because she can.
After everyone is done calming down, Asgore eventually decides to not inform the rest of the Underground about the now-broken Barrier until further notice, with Alphys making plans to extract the SOULs from Sans. When Sans and Papyrus return to Snowdin, nobody recognizes Sans, whom Papyrus calls his 'cousin'. Later that night, Sans can't sleep because of the SOULs talking inside of him, and he goes outside only to fall asleep later.
Seraphim Sans possesses a Gaster Blaster, which is missing its bottom jaw, that is shown to be constantly floating above him, with a crimson-red iris which is swirling around in one of its sockets. This iris is said to symbolize Frisk and Chara's crimson-red Soul.
Seraphim Sans also possesses a multi-colored sweatshirt scarf that has a fluffy rainbow hood. Seraphim has three mandibles with no purpose whatsoever that make up his neck, which ends up with the skull missing its jaw.
He also possesses three sets of wings. The bottom pair are those of the "Grim Reaper'", though the bottom pair's phalanges are colored an orchid-purple and possesses an eye on the crest of each wing, whose irises symbolize Bravery and Perseverance.
The pair in the center are those of a demon's wings, each of their forearms are colored a cerulean-blue and each of their wing-membrane a chartreuse-green. Again, they possess an eye on the crest of each wing, whose irises symbolize Justice and Integrity.
The topmost pair are bird wings, that are red and orange with two eyes, Kindness and Patience. Seraphim Sans wears dark shorts with light blue stripes. His teeth are very sharp and look like knives, and he has a long tail that ends with a giant bone scythe.
His posture shows his ribs, in which is encased the soul representing Determination (Frisk's soul), Sans' own monster soul being in his abdomen (inside of his chest).
His arms are black, with a heart-shaped hole in them. His general appearance suggests that Sans has transcended concepts like "evil","good","monster" or "human", becoming a being close to Sans himself.
The word Seraphim is plural, meaning there are multiple versions of this Sans, if there was really one it'd be Seraph Sans
- PATIENCE never wants to fight it out, but is very social.
- BRAVERY is always wanting to charge headlong into battle, with a fiery attitude.
- JUSTICE is willing to FIGHT for what is right.
- INTEGRITY is always being sassy.
- PERSEVERANCE is analytical and doesn't talk as much.
- KINDNESS prefers MERCY and helps people feel better.
- Frisk is regretful of all the resets and is always warm and friendly to Sans.
- Chara is mostly uninterested and sarcastic. They will go crazy if they are given control of the whole body.
To Be Added...
- The Thought got a very popular fandub by StarBotDubs, currently at over 10,500,00 views