Introduction:
In this fic, Frisk is an adult woman living on the surface at the time the monsters escape from The Underground. "But then how'd they get out?" you ask. Oh, you'll see. I definitely have a plan. Definitely. I've thought it alllll out. 100% not making it up as I go. To my knowledge, this is the first Underfell/Slavetale Frans fic, and probably the only Slavetale fic that's supposed to be funny and not depressingly grim. There are some sad parts but there won't be any gratuitous violence, self-harm, or sexual abuse- Sans deals with enough of that fuckery in this fandom already. The setup is heavily based on the original "Slavetale" story by V_mum, wherein the reader saves an enslaved Sans from an owner beating him up on the street and accidentally becomes his owner. It also draws inspiration from "Blood and Marrow" by Tiocpi(washi)
Chapter 1: Prologue
Eight years ago, magical monsters emerged from their centuries-long imprisonment under Mt. Ebott and immediately declared war on humankind. Using the souls of seven humans, presumed to be among the plethora of missing persons cases for which Ebott was infamous, the monsters broke a magical barrier apparently constructed by humans of old to prevent just such an escape. Their king, made preternaturally powerful by these souls, spearheaded an assault that absolutely devastated the surrounding cities. The monsters slaughtered without conscience, uncaring if their victims were armed soldiers or children begging for mercy. Human weapons were powerless against their magic and accelerated healing abilities.
In the height of desperation, human government made the incredibly controversial decision to nuke Mt. Ebott; an action of which the ramifications would never be determined, as the monsters somehow redirected the warhead into space. Unable to track its location, all humans of the world collectively held their breath until an enormous cloud of dust on the moon's surface marked the missile's impact on the celestial body a week later.
While monsters celebrated this, their greatest victory, the moon-nuking marked a turning point in the war. Until then, the monsters' assault had been limited only to North America, where Mt. Ebott was located. However, worldwide outrage over the attack on the moon provoked international action. Scientists and technological experts worked together, their efforts culminating in the development of magical control collars. These devices, while having no effect on humans, could not only disable a monster's ability to fight, but also completely override their actions.
The fighting quickly turned from monsters against humans to monsters against other monsters controlled by humans. Six months later, the monster king was dead and any free monster still alive was on the lam.
With the immediate threat neutralized, the government was now faced with the difficult question of what to do with the thousands of monsters they'd captured during the war. It didn't take long for money-making entities to see the potential profit in using collar-controlled monsters as magical slaves, and they lobbied for the release of all monsters to the public market. Opposition was strong, but in the end it was impossible to defend a race who had so ruthlessly slaughtered civilians. The public saw enslavement as justice; if anything, it was more mercy than the murderers deserved. A faction of "Eliminationists" lobbied for all monsters to be terminated, and warned that dependency on the control collars was dangerous, but they were a minority. Seven years after the end of war, monster slaves were a ubiquitous presence in most major US cities.