I have an Idea for an Undertale AU. And apparently, it's a good idea? So here, have a book. --- Long ago, two races ruled the earth. But when a plague of corruption swept through one species, causing a half of their population to attack the humans, the humans thought it safer to banish all the monsters underground. Now, the Underground is a Battleground. The battleground of the Pure and Corrupt armies. This Is UnderCorrupt. -- COMPLETED!

Sans, The son of Gaster the Royal Scientist. A gifted boy who must find a away to accept the absence of a father and given the Underworlds fate by his fathers crypted messages through a strange and confusing alphabet. Sans must decide is it worth bringing back his father but putting the fate of the underground in jeporday. Or will he save everyone else and let his father rest behind?