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For the music track of the same name, see Barrier (Soundtrack).
Barrier

The Barrier is a strong magical force separating the Underground from the Surface. The humans put this in place after The War to keep the monsters trapped within the Underground and the rest of humanity safe on the Surface.

Any human can fall through the barrier on Mount Ebott into the Underground, leaving them in the Ruins, where Toriel generally finds them. However, only a being with the SOULs of a human and a monster can pass through from the Underground out to the Surface. The barrier can be broken, but seven human souls are required to do so. Only eight humans have ever fallen through the barrier, including the protagonist.


Plot Elements
Plot Elements Boss Monster • Delta Rune • Echo Flowers • Golden Flowers • Player • SOUL
The War of Humans and Monsters • Determination • Barrier
Locations
Surface Mount Ebott • Underground
Ruins Spider Bake Sale • Home • Toriel's Home
Snowdin Snowdin Forest • Mysterious Door • Grillby's • Papyrus and Sans's House
Waterfall Garbage Dump • Blook Acres • Undyne's House • Snail Farm
Temmie Village • Artifact Room • Gaster Room
Hotland Lab • Art Club Room • MTT Resort • CORE • True Laboratory
New Home Asgore's Home • Barrier

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