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FS!Underkill is a AU made by me Fight_Studios. History: Frisk break the barrier in neutral route, but the monsters who survived escaped too, but the humans started other war, and sealed the monsters again, Mettaton become the king and made a rule: If a human fall here, kill, with no mercy. Because he get mad when the humans sealed them again, Mettaton made Alphys revive the monsters who died like: Undyne, Papyrus, Toriel, etc. and she do it, but... the monsters turned into psycho's, like Mettaton, then, every monster turned into a maniac and mad. Genocide Final: Chara, The DEATH soul, delete the whole world of Underkill. Pacifist Final: Every monster get normal again and be free. Neutral final: You fight Mettaton, when he failed to get your soul, he get the human souls, and revive Asgore again...
