That Golden Butterfly {Gaster Sans X Reader}

There's a prophecy that's been told among monsters:
When the barrier shatters, and war breaks out, there will be one amongst them all, who shall rise up and with the help of a golden butterfly, the monster race shall be victorious.
Most of the monsters thought it was all just a fairytale for the little ones to motivate them to do their best, but little did they know..

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Thank you for reading and enjoy!

I do not own Undertale or the Echotale AU. I'm just using their characters and taking them on a trip through my imagination.

!!Strong language and content, readers who might not be prepared for the craziness and might be triggered are advised to be cautious or avoid such content!!

~W. D. Girl