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Gaster

A man who listens

But rarely speaks
Susie: Oh my full name? It's Susie Gaster-
Once upon a time, a LEGEND was whispered among shadows.
It was a LEGEND of HOPE.
It was a LEGEND of DREAMS.
It was a LEGEND of LIGHT.
It was a LEGEND of DARK.
This is the legend of DELTA RUNE
For millenia, LIGHT and DARK have lived in balance,
Bringing peace to the WORLD.
But if this harmony were to shatter...
a terrible calamity would occur.
The sky will run black with terror
And the land will crack with fear.
Then, her heart pounding...
The EARTH will draw her final breath.
Only then, shining with hope...
Three HEROES appear at WORLDS' edge.
A HUMAN,
A MONSTER,
And a PRINCE FROM THE DARK.
Only they can seal the fountains
And banish the ANGEL'S HEAVEN.
Only then will balance be restored,
And the WORLD saved from destruction.
Today, the FOUNTAIN OF DARKNESS-
The geyser that gives this land form-
Stands tall at the center of the kingdom.
But recently, another fountain has appeared on the horizon...
And with it, the balance of LIGHT and DARK begins to shift...
DELTARUNE
by Bonkaaaaaaaaaaaaaaaaaaaaaa December 9, 2025
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Gaster Bullshit

"Gaster Bullshit" is when a game has major fourth wall breaks, ARG links, hidden mysteries, or anything other elements that could be compared to W.D. Gaster. Also used for any sketchy shit going on in Deltarune that probably connects to him.
"I heard oneshot had a bunch of gaster bullshit so i had to give it a try"

"WHAT DO YOU MEAN THE KNIGHT HAS HOLES IN ITS HANDS??? THIS IS GASTER BULLSHIT BRO"
by ElliottLava January 10, 2026
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Gaster Effect

The Gaster Effect (Undertale term) is when a person mistakenly links anything slightly mysterious, or anything slightly resembling Gaster (leitmotifs, font or face) relating to Undertale or Deltarune, to the character W.D. Gaster, even if it is very hard. This is usually because Gaster is very mysterious and of a certain significance to said games' lore. In most cases, relating things to Gaster is not appropriate for the situation and/or possibly misleading.
A: Woah that new Deltarune song has Gaster's Theme playing at 0:44! If you listen to the piano...
B: Those are just arpeggios. You've got the Gaster Effect
by Stratollera April 15, 2024
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