I call this au Quacktale because everyone is a duck(except frisk)

lore: ducks of all kinds were almost hunted to extinction so to get revenge the ducks declared war on humanity, however humanity built robots to help them fight, which is how humanity won, The remaining ducks fled to a cave under Mt. Ebbot. the king duck declared that any human that falls will get destroyed so far they have 6 souls and frisk(who has scars from the war) is the last human soul that they need.