UnderDeceive is au I made and I plan to make a animation for it.
The au is basically chara betrays everyone and starts killing monsters in snowdin. papyrus died so sans gives no mercy to any human, because chara killed his brother. when fisk falls into the underground frisk discovers the ability of determination. frisk is the first human to get past sans
Also the design of the characters are not 100% done so sans might look different in the animation I make if I do post it.
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