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Exact location:
In the final corridor of New Home, just before entering King Asgore's throne room.
There Sans:
It blocks your path
Break the fourth wall
It attacks you because it knows you've killed everyone.

Sans is a character from the video game Undertale, created by Toby Fox.
💀 It's a short skeleton, wearing a blue sweatshirt, shorts, and slippers.
😂 He has a lazy, sarcastic personality and tells a lot of bad jokes.
👬 He is Papyrus' older brother.
🏠 He lives in Snowdin and works as a sentry (although he almost never does his job).
👁️ Although he seems relaxed, he is very intelligent and observant.
⚖️ Represents the player's moral judgment.
⚔️ In the genocide route, he becomes the most difficult final boss in the game.
Deep down, Sans is someone who knows that time resets, remembers the player's mistakes, and only fights when there is no other option.

Sans wants to kill you on the genocide route for a very clear and serious reason:
👉 Because the player has killed everyone.
In more detail, but still simple:
⚖️ Sans judges your actions: during the game he observes you and knows how many monsters you killed.
💀 On the genocide route, you exterminate all monsters, even the innocent ones.
🧠 He knows you can reset time, so he understands that if he lets you pass, the world will be destroyed again and again.
🚫 He no longer fights for revenge or power, but to stop you for good.
😔 He fights even though he knows he'll probably lose, just to give you one last chance to surrender.

😄 Joking and sarcastic: makes bad jokes all the time and makes fun of almost everything.
😴 Lazy in appearance: avoids work and seems carefree.
🧠 Very intelligent: understands things that other characters don't, like time resets.
👁️ Observant and attentive: always watching what you do, even if it doesn't seem like it.
⚖️ Moral and fair: believes in responsibility for actions; judges the player.
😔 Sad and tired inside: he knows that many things are repeated and that wears him down.
🛑 Decisive when necessary: ​​on the genocidal route, stop joking and act with total seriousness.

💀 Karma (KR): Its attack ignores part of the defense and causes continuous damage if the player has committed many deaths.
🦴 Magic Bones: Summons white and blue bones to attack.
Whites: they always cause harm.
Blue ones: they only hurt if you move.
🔥 Gaster Blasters: huge skulls that shoot very powerful energy beams.
🌀 Teleportation: can move instantly, making it very difficult to hit.
👁️ Gravity Manipulation: Changes the player's gravity during combat.
⚡ Extreme speed: dodges almost all attacks.
😴 Limited resistance: only has 1 HP, but compensates with dodges and tricks.
🧠 Time awareness: seems to remember resets and know the player's routes.