Why Do You Fight Sans in Undertale?
You fight Sans in the Genocide Route because he’s trying to stop you from erasing the Underground and everyone in it. It's his last stand to protect his world from you, the ultimate threat.
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Why fight Sans? Because you chose the Genocide path and wiped out everyone else. He's the last line of defense, and he's had enough.
Sans basically becomes a boss fight when you're on the Genocide Route—he's super hard because he doesn't want you to succeed, obviously.
Sans fights you to avenge his brother Papyrus and to try to save everyone from your rampage. It's an emotional battle because he's not just some random enemy; he has deep personal stakes.
👀 If you like Undertale...
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