I was playing my favourite game: BioShock, and I had a sudden thought. Imagine if the Underground was something like Rapture. I made this AU.
Disclaimer: UnderShock is NOT BioShock. It is inspired by the design and underwater concept. Frisk finds herself in rapture. With a talking flowers help, she tries to find her way back to the surface. However, the more she explores the underwater world, she makes new friends. Frisk is inspired by 'Little Sisters' and 'Big Sisters'. The first monster Frisk meets is Toriel. It has been a long time since she has seen a human. The ruins - a place where 'Little Sisters and Brothers' are raised in. Toriel is the caretaker. Frisk leaves the ruins and meets the skeleton brothers. Papyrus is training to be a 'Big Brother'. Sans explains 'Big sisters and Brothers' were needed to protect certain LS and LB who are able to harvest determination. But there hasn't been anyone with that power in a long time. Undyne is the 'last Big Sister' and the one 'training' Papyrus. She later reveals she never had a LS or LB to protect when they go to harvest determination. She vows to protect Frisk as they're the first child to have the power in years.
Muffet, like normal, is protective of her spiders. She believes Frisk doesn't like Spiders but this isn't true. Meeting Alphys, Frisk finally learns why LS/LB can harvest determination. Determination gave some of the monsters their abilies and powers, why is why it was dangerous for LS/LB to harvest alone. They hope Determination can free them from underwater. Jazz Mettaton. Before Frisk woke up in Rapture, there where two others that was able to harvest Determination. The first human child; Chara and Asriel. The two eventually tries Determination - Chara becomes sick and Asirel instead of becoming sick, becomes Flowery.
